Mom's Rhubarb Pie

1 c. sugar
3 Tbsp. flour
2 egg yolks
1/4 c. milk
combine all together in bowl.
Add 2c. diced rhubarb. Beat 2 egg whites stiff and fold in. Bake at 400 degrees for 15 min., then reduce heat to 350 degrees and continue to bake for another 45 min.