Frittata with Asparagus, Tomato, and Fontina

6 large eggs 2 tablespoons whipping cream 1/2 teaspoon salt , plus a pinch 1/4 teaspoon fresh ground black pepper 1 tablespoon olive oil 1 tablespoon butter[...]

1 1/4 cups egg substitute or 5 large eggs 4 tablespoons freshly grated parmesan cheese 2 tablespoons skim milk 1/4 teaspoon freshly grated lemon zest 1/2[...]