How to make French Onion Tart

How to make French Onion Tart Savory tarts are not as popular as dessert tarts, but this French Onion Tart is definitely worthy of the attention. It has a super flaky crust, tons of caramelized onions, feta cheese and bacon. Quiche is great, but I would take a delicious savory tart anyday of the week. This is a great dish to take with you to a potluck, family dinner, or just make it and have it for breakfast or a snack. 2 cups all purpose flour 1.5tsp kosher salt ½ cup butter unsalted 1/2c cold water 7 cups onions 2ea garlic cloves 1Tbsp rosemary 1ea egg 1/2c heavy cream 4ea bacon slices Kosher salt Black pepper