Preheat oven to 450°F.
Spread jelly in cooled shell. Cream butter and 2/3 cup sugar, then beat in yolks one at a time. Beat in lemon juice. Place in oven and bake 5 minutes. Turn heat down to 375°F and bake 20 minutes more. Pie should be browned but not set. Remove from oven.
3 egg whites
1/3 cup sugar
Preheat oven to 425°F.
Beat egg whites until stiff, then gradually beat in 1/3 cup sugar. Continue beating until meringue is stiff and glossy. Heap on pie and bake in upper part of oven about 5 minutes, until meringue is hot and lightly browned. Serve pie warm.