Roasted Tomato Pie with Buttermilk Biscuit Crust - thyme and butter

Ingredients

• 1 pie crust, (I used pre-made refrigerated)
• 5-6 fresh tomatoes, sliced
• ¼ cup flour
• about ¼ cup fresh basil, sliced thin or "chiffonade"
• ¼ onion, sliced thin (I used a mandoline)
• 1 clove garlic, grated
• ½ cup mozzarella cheese, grated
• ½ cup sharp cheddar cheese, grated
• ¾ cup mayo
• salt and pepper to taste
• 1 cup self rising flour
• ¼ cup salted butter, very cold
• ½ cup buttermilk
• ½ tablespoon sugar
• 1 pinch salt