Roasted Cauliflower Steaks with Creamed Spinach

Ingredients

• 1 to 2 heads cauliflower, leaves removed (3 lb. total)
• 1 large sweet onion, sliced ¼-inch thick
• 1 teaspoon reduced-sodium tamari
• Freshly ground black pepper, to taste
• 1 lb. fresh baby spinach
• ¼ cup thinly sliced shallot
• 3 cloves garlic, minced
• 2 tablespoons whole wheat flour
• 2 tablespoons nutritional yeast
• 2 cups unsweetened, unflavored plant-based milk
• ¼ teaspoon freshly grated nutmeg
• 3 cups hot cooked farro
• Red pepper flakes, to taste