01 -
Combine the lemon juice, water, and sugar in a bowl. Quickly dip the ladyfingers into the mix and line your mold with them.
02 -
Let the gelatin soften in cold water. In a saucepan, stir together the eggs, sugar, lemon zest, and juice. Heat gently while stirring until it thickens. Take it off the heat, stir in the softened gelatin and butter, and pour it all over the cookie base. Chill for at least 4 hours.
03 -
Beat the egg whites with the pinch of salt until they form peaks. Gradually add the powdered sugar and keep whipping until the meringue is glossy and firm. Spread it over the unmolded charlotte, and brown delicately with a torch or under a broiler.