Courgette Gratin (Gratin de Courgettes)

This is such a gorgeous summer dish celebrating the delicious flavours of seasonal tomatoes and courgettes. Inspired by a traditional French gratin, this is my go-to easy entertaining recipe (I seem to make it on repeat all summer!) served with a selection of summer salads or a simple summer supper with some really good quality hot crusty bread and a side salad. It looks so impressive but, like so many of my recipes, doesn’t take too much effort and relies on the oven to do the hard work. All you have to do is sit back, relax with your delicious meal and pretend you are on holiday in the South of France…

Why I love this Courgette Gratin (Gratin de Courgettes):

• The perfect summer recipe to use up a glut of courgettes and make the most of seasonal tomatoes.
• Ideal for entertaining as it looks so impressive but is actually very simple - plus it can be prepped ahead.
• A delicious way to eat more vegetables.
• It is suitable for vegetarians (make sure your pesto doesn’t contain Parmesan) and can be adapted for vegans.

A note on the serving size:
I always find it a bit tricky to say how many people my recipes serve as I like to have (and serve) generous portions (Nigella and I are kindred spirits on that front). This Courgette Gratin (Gratin de Courgettes) would serve 4 people generously, or 6 people who prefer smaller portions.

What you will need for this Courgette Gratin (Gratin de Courgettes):

Olive oil - a good quality olive oil adds a lovely flavour to the tomato sauce at the base, as well as the vegetables when drizzled on top. You could also use rapeseed oil - Borderfields have some delicious flavours which would work really well in this Courgette Gratin (Gratin de Courgettes).
Cherry tomatoes - plump and juicy seasonal cherry tomatoes make the most delicious homemade tomato sauce. You could use baby plum tomatoes instead.
Garlic cloves - you don’t need much garlic in the tomato sauce as there is garlic in the Boursin and the pesto garnish. You could substitute for garlic granules if you have run out of fresh.
Basil - adding some leaves to the tomato sauce adds a lovely basil flavour throughout the dish. The basil leaves look beautiful as a garnish on top too.
Garlic and Herb Boursin - this soft and creamy French cheese that takes this Courgette Gratin (Gratin de Courgettes) to the next level. Its signature flavour works beautifully with the vegetables.
Courgettes - I like to use a variety of different colours from dark green to striped to bright yellow. The latter taste slightly sweeter and are absolutely delicious. You could use all regular courgettes if you prefer.
Thyme - I like to use freshly plucked thyme but you could use a generous pinch of dried thyme or herbes de provence if you can’t get hold of fresh.
Plum tomatoes - opt for ripe, plump and juicy tomatoes and cut thinly using a sharp knife.
Salt - I recommend Maldon Salt for the best flavour. You could use their chilli flavour for a bit of heat, if desired.
Black pepper - freshly ground black pepper adds a hint of warmth. You could use mixed peppercorns for a more complex flavour profile.
Double cream - also known as heavy cream. You need the higher fat content to get the right texture so don’t be tempted to use single cream.
Fresh pesto - either homemade or shop bought. If using the latter, I like to buy the pot in the chilled section, it is a world away from the jarred version.

Substitutions and Variations

Boursin: I think the Boursin really makes this dish so I recommend trying to find some if you can. If you can’t get hold of any, Roule is fairly similar and could work as an alternative. Alternatively, you could just leave it out.

Cherry tomatoes: I love using cherry tomatoes here but you could use baby plum tomatoes instead.

Thyme: If you can't find thyme or don't like it, dried herbs de Provence is a good choice or fresh rosemary works too!

Cooking Tips

Using a mandolin: I love my mandolin - it is one of my favourite kitchen gadgets as it makes slicing vegetables thinly unbelievably quick and easy. However, they are very sharp and, if not used correctly, can be dangerous. Always make sure what you are cutting has a flat surface and wear a hand guard at all times. If you prefer not to use a mandolin, slice very thinly using a sharp knife or use the slicing attachment on your food processor.

Assembly: If you aren't that particular about the layering and the look, then don't worry too much and just make sure that the Boursin is nicely spread between veggies and then it will still roast nicely all together.

Frequently Asked Questions

Other recipes you may enjoy:

This is another boursin favourite of mine, it's Boursin Tomato Pasta and a really simple delicious pasta. I also love courgettes in other recipes, you should try my Easy Courgette Lasagne if you do too. I love to garnish this gratin with some pesto drizzled over the top. If you want to make your own, this Pasta al Pesto recipe post has all the details.

Made this recipe and loved it?

I would love love LOVE if you could leave a review in the comments…  I love hearing what you thought, any changes you made, the stories behind what made you try my recipes. Also, if you share a photo on Instagram, please tag me @desertislanddishes, it makes my day to see you making my creations!

Courgette Gratin (Gratin de Courgettes)

Print Recipe

Pin Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star

No reviews

This gorgeous gratin is bursting with the flavours of sweet tomatoes, courgettes and fresh basil. A true celebration of summer...

• Author: Margie
• Prep Time: 15 minutes
• Cook Time: 45 minutes
• Total Time: 60 minutes
• Yield: Serves 6
• Category: Adaptable for Vegetarians, Adaptable for Vegans
• Method: Oven
• Cuisine: French
• Diet: Vegetarian

Ingredients

Scale 1x2x3x

• 2 tbsp olive oil, plus extra for drizzling
• 400g cherry tomatoes
• Salt and freshly ground black pepper
• 2 cloves garlic, finely sliced
• ½ bunch of basil, finely sliced
• 8 courgettes, a variety of colours ideally but any will work
• 3 sprigs of fresh thyme
• 6 large ripe tomatoes 
• 150g Garlic and Herb Boursin, at room temperature

For the whipped Boursin:

• 150g Garlic and Herb Boursin
• 100ml double cream

To garnish:

• Fresh basil leaves 
• 2 tbsp fresh pesto

To serve:

• Hot crusty bread
• Fresh green salad

Cook Mode Prevent your screen from going dark

Instructions

1. Preheat the oven to 180C Fan. Set out an oven-proof serving dish - I use a 25.5cm (10-inch) pie dish but you could use a roasting tin or any other similar-sized dish with high-ish sides.
2. Make the tomato sauce: heat the olive oil in a large non-stick frying pan over a medium-high heat. Once hot, add the cherry tomatoes, season well and cook for 3 minutes or until the tomatoes start to burst. Using the back of a wooden spoon, break them down to form a sauce. Add the sliced garlic and cook for another 30 seconds, stirring occasionally.
3. Tip into your serving dish and sprinkle with the sliced basil. Set aside.
4. Using a mandoline, thinly slice the courgettes. Tip into a large mixing bowl and drizzle generously with olive oil, then season with salt and freshly ground black pepper. Sprinkle in the freshly plucked thyme leaves from the sprigs. Use your hands to coat the slices with the oil and seasoning.
5. Using a sharp knife, thinly slice the tomatoes, place into a bowl and season with salt and freshly ground black pepper.
6. To assemble, carefully arrange 2 rows of courgette slices. Spread some of the Garlic and Herb Boursin onto the tomato slices before adding a neat row next to the courgette. Repeat, alternating between 2 rows of courgette, followed by 1 row of Garlic and Herb Boursin-spread tomato, until you have filled your dish.
7. Drizzle with olive oil and season with salt and freshly ground black pepper. Bake for about 35 minutes or until softened and golden.
8. Meanwhile, make the whipped Boursin: place the Boursin and double cream into a food processor and blitz for about 1 minute - or until smooth and creamy. Spoon into a bowl.
9. Once the gratin is cooked, remove from the oven and garnish with a few dollops of the whipped boursin, some fresh basil leaves and a drizzle of fresh pesto.
10. Serve with hot crusty bread, the remaining whipped boursin and a fresh green salad. Enjoy!

Notes

• If you want to add a bit of texture, you can sprinkle over pangrattato for crunch.
• When using a mandolin, always follow the relevant safety procedures. Make sure what you are cutting has a flat surface and wear a hand guard at all times. If you prefer not to use a mandolin, slice very thinly using a sharp knife or use the slicing attachment on your food processor.
• I would definitely recommend only using fresh pesto - it is a world away from the jarred versions and works much better in this dish which is all about celebrating the beautiful flavours of summer.
• If making this dish for vegetarians make sure your pesto doesn’t contain Parmesan.
• You can make this recipe suitable for vegans by using Boursin Plant-Based, a vegan-friendly double cream and making your own fresh vegan pesto. You could make it without the Boursin and whipped Boursin, if you like.