Rind ; one lemon FOLD altogether and put in baking dish to cut into squares after it set up, or in a graham cracker pie crust. Place in refrigerator for at least 12 hours. If it doesn't set up well, freeze for about 1/2 hour. I've had it set up beautifully at times, and at other times really be too runny to be pretty! A sprig of mint on top makes it especially good to look at.