INGREDIENTS
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3 tablespoons butter or margarine, at room temperature
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2 tablespoons Dijon mustard
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1/2 cup dry white wine
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1/4 cup minced shallots
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1 cup whipping cream
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Salt and pepper
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8 large eggs
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4 thick slices (about 2 oz. each) challah
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4 ounces Appenzell or gruyère cheese, thinly sliced
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4 ounces thinly sliced prosciutto
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4 ounces salad mix (about 2 qts.), rinsed and crisped