Separate the egg. Put the yolks aside. Knead flour, almonds, icing sugar, 75 g butter and egg white to a smooth short pastry. Cover and chill for about 30 minutes. Roll out the short pastry on a work surface dusted with a little flour until round (28 cm Ø).
Place in a greased tart or springform pan (24 cm Ø) and press down at the edges. Cut out a round piece of baking paper (30 cm Ø) and place it on the shortcrust pastry. Pour legumes on top. Bake in the preheated oven (electric cooker 200 ° C/ gas: level 3) for about 15 minutes.
Remove baking paper and pulses. Bake at the same temperature for another 10-15 minutes. Leave to cool in the tin. Mix starch in 75 ml cold water. Bring lemon juice, brandy and 100 g brown sugar to the boil.
Stir in the starch, bring to the boil while stirring once. Stir 6 tablespoons of the hot lemon mixture into the egg yolk with a whisk, then stir the egg yolk-cream mixture into the remaining lemon mixture.
Let it cool down a little. Stir the rest of the butter in pieces with a whisk into the lukewarm lemon mixture. Remove the shortcrust pastry base from the mould, pour in the lemon mixture and chill for at least 2 hours.
Before serving, sprinkle with remaining cane sugar and decorate with lime and lemon slices and lemon balm. Makes 12 pieces.