For the curd cheese mousse, soak gelatine in cold water, whip cream and egg white separately until stiff. Grate the lemon, then squeeze the juice.
Then mix the curd with yogurt until smooth and stir in the cucumber, garlic, lemon zest, salt and pepper. Heat the lemon juice and dissolve the well squeezed gelatine in it. Quickly stir the mixture into the curd and let it cool down.
As soon as the curd mixture begins to gel, fold in the whipped cream and beaten egg whites, cover the bowl and leave to set overnight in the refrigerator. Cut out shapes and serve the cucumber and curd mousse with the smoked char.