Preheat the oven to 355°F (180°C/160°C fan). Grease and line a 9.5 x 4-inch (24 x 10 cm) loaf pan with parchment paper. Alternatively, grease with butter and coat with a little flour if you are confident it is very non-stick.
Put the eggs, flour, baking powder, superfine (caster) sugar, butter, and lemon zest into a food processor. Blitz until combined to form a smooth cake batter, scraping down the sides as necessary.
Scrape into the prepared pan and bake in the preheated oven for about 30-35 minutes - or until well risen, bouncy to touch, and a skewer inserted into the center comes out clean.
Meanwhile, while the lemon loaf is baking, sieve the confectioners' (icing) sugar into a medium-sized bowl. Mix in the lemon juice to form a smooth icing.
Once the cake is baked, use a sharp knife or skewer to poke holes across the top, making sure you go all the way down to the bottom. Gradually pour over the icing, a little at a time, ensuring it is evenly distributed across the cake. Leave it to soak in before pouring over the remaining glaze.
Leave in the pan to finish cooling completely.
When ready to serve, remove from the pan and set onto a flat serving plate. Scatter around a few fresh raspberries and dust with icing sugar. Cut into slices and serve with freshly brewed tea.