The Best Rhubarb Cake
["1 c. butter", "2 c. flour", "2 Tbsp. sugar", "6 egg yolks", "1 c. sour cream", "4 Tbsp. flour", "2 c. sugar", "5 c. rhubarb", "1/4 tsp. salt"]
["Blend first 3 ingredients and bake for 10 to 15 minutes in a 9 x 13-inch pan at 350\u00b0.", "Mix remaining ingredients well together. Pour over crust and bake at 350\u00b0 for 40 to 55 minutes or until set."]
["butter", "flour", "sugar", "egg yolks", "sour cream", "flour", "sugar", "rhubarb", "salt"]