Tomato Tart with Pesto & Onions

INGREDIENTS

1 cup

flour

1/2 tsp

kosher salt ( or sea salt)

1/4 cup

cold unsalted butter (, (1/2 stick) cut into 1/2-inch (12-mm) pieces)

1/4 cup

cold water

1 lb

fresh tomatoes (, slice about 1/2" thick)

1/4 cup

pesto (, recipe follows)

1/2

medium onion (, sliced about 1/4" thick)

3 oz

goat cheese

1 tsp

fresh thyme leaves (, optional)

sea salt (or kosher salt or any preferred finishing salt)

freshly cracked black pepper (, to taste)

" tart pan