Special equipment: 2 empty ice-cube trays 24 miniature paper cupcake liners for serving, or toothpicks
Beat the cream cheese, lemon zest and juice, vanilla, and sugar together until very smooth. Mix in the sour cream. Sprinkle the gelatin over the water in a small bowl and set aside for 5 minutes. Warm in the microwave for 30 seconds (or in a saucepan over medium heat) and stir to dissolve. Quickly mix into the cream cheese mixture. Fold the whipped cream into the cream cheese mixture.
Pour 1/2-inch of this filling into each of 24 ice-cube compartments. Freeze 15 minutes to firm up. Meanwhile, cut the strawberries in half. Place a strawberry half in each compartment. Pour the filling over the berries to cover and fill each compartment to the top. Freeze at least 3 to 4 hours. (The recipe can be made up to this point, wrapped, and kept frozen up to 3 days in advance.)
Stir together the crushed wafers and walnuts on a plate. When ready to serve, pop out the croquettes and roll in the crumb coating. Place in frilled paper cups or stick each one with a toothpick, and serve.
Recipe courtesy of Gale Gand, Gale Gand's Just A Bite by Gale Gand and Julia Moskin: Clarkson N. Potter Publishers, 2001