French OnionTart

French OnionTart was pinched from <a href="https://food52.com/recipes/10177-french-onion-tart" target="_blank" rel="noopener">food52.com.</a>

"The seedling of an idea for this recipe started while I was making cheddar cheese crackers for the kids. The thought occurred that it might be an interesting base for a tart crust. As I wandered through the farmers' market later that day, in search of some "late winter" inspiration, a bunch of humble onions set the ball rolling. It was at the moment I knew I wanted to recreate the flavors of a French onion soup into my tart. While the directions seem long, it really does come together effortlessly, and well worth the time it takes to caramelize the onions...."

INGREDIENTS
1 tablespoon extra virgin olive oil
2 pounds yellow onions, peeled & sliced thin
2 sprigs fresh thyme, leaves removed & stems discarded
Sea salt and freshly ground pepper, to taste
1 large egg, lightly beaten
1 teaspoon sherry vinegar
2/3 cup (2 ounces) Swiss cheese, shredded
3/4 cup (110 grams) whole wheat pastry flour
1/4 teaspoon (2 grams) fine sea salt
1/4 teaspoon paprika
1 cup (3 ounces) Swiss cheese, shredded
4 tablespoons (2 ounces) very cold butter, shredded using a box grater
1 to 2 tablespoons cold seltzer
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