If using, sprinkle a light layer, about 1-2 TB, of Pecorino Romano cheese over the ricotta cheese.
Place the assembled tart on a sheet pan, then place in the oven. Bake for 30 minutes, then check to see if the crust is browning too dark. If the crust edge is browning too quickly, cover the rim with aluminum foil, but careful not to cover the tart filling. Continue baking, checking the tart every 10 minutes or less, when you get closer to the end. It could take around 50 minutes total time. The tart is done when the juices throughout the tart bubble, the tomatoes are shriveled, and the Romano cheese begins to brown on top. Also, when the crust has a nice golden-brown color.
Remove the tart pan rim. Carefully place the tart on top of a large can of tomatoes or other can or bowl with a secure flat top. Carefully hold the pan rim and slide it down off the tart. Place the tart on a cooling rack and continue to cool. When cool use a wide spatula to help slide the tart off the bottom portion of the tart pan. (Or you can leave it alone if you don't want to take any chances). Garnish right before serving with fresh lemon thyme and born fresh basil leaves.
Sumac is the ground berries from a Sumac bush. It has a slightly bitter taste and a popular seasoning in Mediterranean cuisine. There is no great substitute to resemble it. If you do not have it, or cannot get it. Sprinkle finely grated lemon zest over the tomatoes when it is done baking.
If you do not own a tart pan, you can make this tart a galette. However, there are some changes in the preparation and baking. There is no need to par-bake the dough. After rolling out the dough, Move the dough to a sheet pan covered with parchment paper. Arrange the tart ingredients over the pastry dough in the same order as in the instructions, leaving a 2-inch border. Fold the rim of the dough over the ingredients and pleat to seal. Refrigerate the galette for 30 minutes. Brush the dough with melted butter, olive oil, or egg wash and bake, following the instructions above.