1 unbaked 9-inch pie shell
2 lbs. sweet potatoes or equivalent in canned potatoes
1/2 c. butter
1 tsp. cinnamon
1/4 tsp. cloves
1/2 tsp. ginger
1/4 tsp. salt
1/4 c. brown sugar
1/4 c. white sugar
3 eggs, separated
1/4 c. lemon juice (optional)
1/2 c. milk

Preheat oven to 450 degrees. Cook sweet potatoes; peel and mash or put through ricer. Add spices, butter, sugars and salt. Beat until light and smooth. Beat egg yolks until light and add to above mixture. Stir in lemon juice and milk. Mix well. Beat egg whites until stiff and gently fold in. Pour into unbaked pie shell and bake 10 minutes. Reduce heat to 350 degrees and bake 25-35 minutes longer or until pie is puffed up and firm.