Tomato Tart

Ingredients

• 4 Tablespoons Butter
• 2 whole Large Onions, Halved And Sliced Thin
• Salt And Pepper, to taste
• 2 whole Storebought Pie Crusts (or 1 Good Sized Homemade Crust)
• 1-1/2 cup Grated Fontina Cheese (or Monterey Jack)
• 1/4 cup Grated Parmesan
• 1/4 cup Grated Gruyere (or Swiss)
• 3 cups Cherry Tomatoes (yellow Or Red), Washed And Dried (more If Needed)
• 1 whole Egg
• 1/4 cup Milk
• 16 whole Basil Leaves, Chiffonade (more If Needed)

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