1 1/2pounds cauliflower (about 1 small cauliflower head or 1/2 large cauliflower head), florets and tender stems cut into large bite-sized pieces
1 3/4cups semi-pearled or pearled farro (about 12 ounces)
1 (32-ounce) jar good-quality marinara sauce
1/4cup olive oil
1/2cup pitted kalamata or “ripe” black olives, roughly chopped (optional)
8 garlic cloves, smashed and chopped
3ounces grated Parmesan (about 3/4 cup finely grated)
1 1/2 teaspoons granulated sugar
1 1/2 teaspoons onion powder
1 1/2 teaspoons dried oregano
1 teaspoon balsamic or sherry vinegar
1/2 teaspoon red-pepper flakes, or to taste (optional)
1 1/2 teaspoons kosher salt
Black pepper
Ingredients for the topping:
1cup panko
2ounces grated Parmesan (about 1/2 cup finely grated)
1 tablespoon olive oil
8ounces fresh mozzarella, sliced into rounds
Recipe variations
Heat the oven to 425°F. In a 9-by-13-inch broiler-proof pan, combine the cauliflower, farro, marinara sauce, olive oil, olives (if using), garlic, Parmesan, sugar, onion powder, oregano, vinegar, and red-pepper flakes. Season with the salt and a generous amount of black pepper. Pour in 1 2/3 cups water and stir well to combine. Cover the pan tightly with foil and bake in the oven for 40 minutes.
Uncover the pan, stir, and continue baking uncovered until the farro is tender-chewy and the sauce is thick, about 15 minutes more. (If the farro has already soaked up all the sauce and the pan is looking dry, stir in 1/2 to 3/4 cup water, just to make sure the farro has enough liquid to become tender and saucy.)
Meanwhile, in a small bowl, make the topping: Stir together the panko, Parmesan and olive oil.
Turn on the broiler. Evenly cover the top of the farro with the panko topping. Top with the sliced mozzarella. Broil on the top rack, about 6 inches from the heat source, for 2 minutes, rotating the pan once and watching carefully for burning, until the panko topping is deeply browned and the mozzarella has melted.