Meanwhile, prepare your onions: Warmth a large sauté pan over medium warmth. As soon as very hot, add 2 tablespoons olive oil. Once the oil is heated, include the onions and 1 teaspoon kosher salt. Cook dinner onions, stirring each and every minute or two, until finally a medium brown, virtually caramel coloured, about 25 minutes. [See Note at end.] Scrape onions onto a plate to interesting whilst you finish the bread.
Finish the focaccia: When the dough is doubled, line a 9×13 cake pan with parchment paper and drizzle 2 tablespoons olive oil about it. Do not deflate your dough, just scrape it on to the oiled parchment. Drizzle the prime of the dough with an additional tablespoon of olive oil and use your fingers to dimple the dough, flattening it out. It is all right if it doesn’t arrive at the edges. Permit the dimpled dough relaxation at home temperature for 15 minutes and warmth your oven to 425°F. Just after 15 minutes, dimple the dough only where by essential a very little further more into the corners. Enable rest for a remaining 15 minutes just before scattering the top with onions, poppy seeds, and a couple pinches of salt.
Bake the focaccia: For 25 minutes, until finally deeply golden brown at the edges and across the major. When it bakes, you can get ready any toppings you’d like to serve it with, such as cream cheese or butter, lox, thinly sliced tomatoes, cucumbers, onions, or capers.
To provide: Loosen the focaccia if it’s stuck in any location and slide it into a cutting board. Cut into 12 squares, utilizing a sharp knife to get as a result of the onions on top rated without having pulling them off, and replacing any that scatter. Eat proper away.
Do ahead: Focaccia keeps at room temperature for 1 to 2 days. Reheat on a baking sheet at 350°F for 10 to 12 minutes.
Notice: These are not caramelized onions we do not will need 60 to 90 minutes in excess of reduced warmth with continuous stirring. That is not how any ancestor of mine cooked onions. I’m intentionally applying a larger warmth for additional promptly designed flavor. If they are not buying up shade by 20 minutes, bump up the warmth a little. If they’re coloring far too quickly to make it to 20 to 25 minutes, minimize the heat. We want to stopping shy of a dark bronzed colour, as the onions will finish in the oven and we really don’t want them to melt away.