Meanwhile, prepare your onions: Warmth a large sauté pan more than medium warmth. At the time incredibly hot, add 2 tablespoons olive oil. At the time the oil is heated, insert the onions and 1 teaspoon kosher salt. Cook dinner onions, stirring each minute or two, right up until a medium brown, just about caramel colored, about 25 minutes. [See Note at end.] Scrape onions on to a plate to awesome although you end the bread.
Complete the focaccia: When the dough is doubled, pour 2 tablespoons olive oil into a 9×13 cake pan. Do not deflate your dough, just scrape it into the oiled pan. Drizzle the leading of the dough with another tablespoon of olive oil and use your fingers to dimple the dough, flattening it out. It is okay if it does not attain the edges. Permit the dimpled dough relaxation at place temperature for 15 minutes and heat your oven to 425°F. Soon after 15 minutes, dimple the dough only where by needed a very little even more into the corners. Allow relaxation for a closing 15 minutes before scattering the prime with onions, poppy seeds, and a few pinches of salt.
Bake the focaccia: For 25 minutes, till deeply golden brown at the edges and across the leading. When it bakes, you can prepare any toppings you’d like to provide it with, these as cream cheese or butter, lox, thinly sliced tomatoes, cucumbers, onions, or capers.
To serve: Loosen the focaccia if it’s stuck in any location and slide it into a cutting board. Slice into 12 squares, using a sharp knife to get via the onions on leading devoid of pulling them off, and changing any that scatter. Consume correct away.
Do in advance: Focaccia keeps at area temperature for 1 to 2 times. Reheat on a baking sheet at 350°F for 10 to 12 minutes.
Notice: These are not caramelized onions we do not have to have 60 to 90 minutes around small warmth with regular stirring. That is not how any ancestor of mine cooked onions. I’m deliberately utilizing a better heat for additional swiftly produced taste. If they are not buying up colour by 20 minutes, bump up the heat marginally. If they are coloring way too fast to make it to 20 to 25 minutes, reduce the warmth. We want to stopping shy of a darkish bronzed colour, as the onions will finish in the oven and we do not want them to melt away.