Author Notes: This focaccia is inspired by the “pizza” focaccia I worship from Liguria Bakery. The one that's topped with tomato sauce and chopped green onions, and despite its name, lacks cheese of any kind. When I moved to New York nine years ago, I felt its loss keenly, thinking of it sometimes twice a day. This version is my attempt to pay homage. To that thin layer of jammy tomato sauce across its top that lends it an almost doughy texture that, when coupled with the crunch of the crisp bottom and the uniquely tight, yet light crumb of the interior, makes for the world's most perfect bite.

"Pizza" Focaccia with Tomato Sauce & Green Onion

Makes: 1 9x13-inch sheet 
Prep time: 1 hrs 30 min 
Cook time: 20 min

Ingredients

• 1cup slightly warm water (222 grams) (it should feel just a tiny bit warmer than your body temperature to the touch)
• 2teaspoons active dry yeast (7 grams)
• 2 1/2cups bread flour (300 grams), plus about 1/3 cup more for kneading
• 1teaspoon kosher salt (7 grams), plus more for sprinkling on top
• 2tablespoons olive oil (28 grams), plus 3 tablespoons olive oil (42 grams), plus 1/2 cup olive oil (110 grams)
• 3/4cup chopped scallions (the green part), divided into 1/2 cup and 1/4 cup
• 1cup canned crushed or pureed tomatoes, preferably San Marzano

Directions

1. Add water to a large bowl, then add the yeast and gently stir. Let sit for 5 minutes, until little bubbles start to appear at the top of the water. Add the flour, salt, and olive oil, and mix thoroughly with a wooden spoon until a shaggy, wet dough forms. Lightly cover a surface with about 1/3 cup flour, and pour the dough onto floured surface. Knead for 5 minutes, until dough is smooth, homogenous, and sticky. If you poke it gently, it will spring back in about 5 seconds to fill the poke mark. (Note: You can make the dough in a stand mixer with a dough hook instead, if you prefer—do the yeast dissolution in the stand mixer, and add the flour, salt, and oil, then mix with the dough hook for 3 to 4 minutes. Be sure to sprinkle in another 1/3 cup or so of flour gradually as you mix to get the same texture as you would by hand-kneading on a floured surface.)
2. Add 3 tablespoons olive oil to a clean bowl, and swirl the bowl around to ensure the sides are greased. Form a loose ball of your dough, and transfer it to the oiled bowl, then gently flip it so both sides are covered in oil. Cover the bowl with plastic wrap and let it sit at room temperature for 60 to 90 minutes, until it roughly doubles in size.
3. Add 1/2 cup olive oil to the bottom of a 9x13-inch cake pan. (This will feel like a lot of oil, but it gets absorbed by the dough as it cooks and makes the most amazing crust.) Transfer your dough to the pan and gently stretch it to fit the dimensions. It will feel like the consistency of soft chewing gum. Sprinkle 1/2 cup of green onions and a large pinch of salt across the top. On top of the green onions, use your fingers to slather the tomato puree, avoiding the edges where the dough meets pan (the sauce will burn). Loosely cover and let the dough proof in the pan for 30 minutes, until it’s puffed up.
4. Meanwhile, heat your oven to 475° F. Once the dough has puffed up, it's time for the most fun part of making focaccia: poking it all over with your fingertips to make dimples. Do this, then bake for 20 to 25 minutes, until the un-sauced edges are a toasty color where they touch the pan, and the pizza-like bubbles that have puffed up across the surface are tinged dark brown in the centers.
5. Remove from the oven and sprinkle with the remaining green onion, a drizzle of olive oil, and more salt to taste. You can slice and eat it as soon as it cools a bit. Refrigerate to store.

https://food52.com/recipes/77943-pizza-focaccia-with-tomato-sauce-green-onion