Golden Potato Puff
["2 Tbsp. soft margarine, for mold", "2 Tbsp. yellow corn meal", "4 c. diced, pared potatoes or 3 c. prepared instant potatoes", "6 eggs, separated", "1 c. (2 sticks) margarine", "1 tsp. salt", "1/4 tsp. white pepper"]
["Coat an 8-cup tube mold well with margarine.", "Sprinkle with corn meal, tap out excess.", "Cook potatoes in lightly-salted water until tender; drain well.", "Shake pan over low heat to dry and fluff potatoes; mash.", "Beat egg whites until they stand in firm peaks. Separately beat egg yolks until thick."]
["margarine", "yellow corn meal", "potatoes", "eggs", "margarine", "salt", "white pepper"]