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In a saucepan, melt butter, add the diced onion, and cook until translucent. Gradually stir in flour. Allow butter-flour mixture to cook for a few minutes. Add the chopped spinach, no need to drain, as water will be part of the liquid additions. Slowly stir in milk and cook until thickened. Reduce heat and stir in grated cheddar cheese. When cheese is melted. Turn off heat and allow to start cooling Add egg yolks one at a time stirring to keep thick, add salt, and pepper to taste. When all yolks are added, start whipping the egg whites, this will allow for more cooling time. Add the baking soda to the egg whites and whip until stiff, they should form and hold peaks. Slowly fold stiff egg whites into cheese mixture. Pour mixture into prepared soufflé pan. Place on middle rack of oven and turn oven down to 350ºF. Bake 30-40 minutes. DO NOT OPEN OVEN for first 25 minutes! Soufflé will hold in oven for about 5 minutes, but ideally should be served immediately. Source: Mastering the Art of French Cooking, Volume One  |
