Soak gelatine in cold water. Wash the lemons and dab dry. Grate the zest of 1 lemon. Squeeze the juice from about 1 1/2 lemons. Separate the eggs. Whip egg yolk and 3 tbsp. sugar until creamy. Stir 6 tbsp. of the juice and lemon zest, except for a little bit
Squeeze out the gelatine and dissolve it dripping wet at low heat. Stir about 3 tablespoons of egg cream into the gelatine, then stir the mixture into the remaining egg cream. Cool until it begins to gel
Whip cream and egg whites separately until stiff. First fold cream, then beaten egg white into the egg cream
Wash and clean the strawberries and, except for 4 pieces for decoration, halve or quarter them. Arrange the strawberries in four dessert glasses. Add lemon foam and chill for about 3 hours
Moisten remaining strawberries with water and roll in 1-2 teaspoons of sugar. Decorate lemon foam with the strawberries, the rest of the lemon peel and possibly lemon balm