Step 1

Thinly slice the tomatoes and layer in a colander to drain, sprinkling each layer with salt. Set aside while you prepare the other ingredients.

Step 2

Add the flour and salt to a food processor and pulse to combine.

Step 3

Cut butter into cubes and add to flour. Pulse into well combined.

Step 4

Sprinkle flour mixture with a couple tablespoons of water. Pulse until a dough forms, adding more water (one tbsp. at a time), if necessary.

Step 5

Remove dough from food processor. Shape into a ball, then flatten it into a disk.

Step 6

Cover dough in plastic wrap and refrigerate for 30 minutes.

Step 7

Heat olive oil in a medium skillet over medium heat, then add onions and saute until browned.

Step 8

Stir garlic into onions and cook until fragrant, about 30 seconds. Season with salt and remove from heat. Set aside to cool.

Step 9

Take tomatoes out of colander and blot dry with paper towels.

Step 10

Combine mayonnaise and 1/2 cup mozzarella cheese.

Step 11

Preheat oven to 400 degrees.

Step 12

Remove chilled dough from refrigerator and roll it out about 1/8 inch thick.

Step 13

Place the dough in a pie pan and trim any excess dough from the edges.

Step 14

Cover bottom of pie with remaining 1/2 cup mozzarella cheese.

Step 15

Top mozzarella with onions.

Step 16

Place a layer of tomatoes over the onions. Season with salt and pepper.

Step 17

Sprinkle half the feta over the tomatoes.

Step 18

Cover the feta with half of the basil.

Step 19

Add another layer of tomatoes, salt, pepper, feta, and basil (in that order).

Step 20

Cover the basil with a final layer of tomatoes, season with salt and pepper.

Step 21

Spread the mayonnaise mixture over the top of the pie.

Step 22

Place pie in oven and bake for about 25 minutes or until top of pie and crust are a deep golden brown.

Step 23

Let pie cool for about 10 minutes, then cut into wedges and serve. Enjoy!