Spicy Tofu Scramble With Tomato and Ginger

Name: Spicy Tofu Scramble With Tomato and Ginger
Ingredients: 1 14-oz. package firm tofu, drained; 4 Tbsp. unsalted butter, divided; 1 Tbsp. all-purpose flour; 1 large red onion, finely chopped; 2 tsp. Diamond Crystal or 1 tsp. Morton kosher salt, divided, plus more; 1 Tbsp. finely grated peeled ginger; 1 Tbsp. ground coriander; 1 tsp. ground cumin; ½ tsp. cayenne pepper; 1 14.5-oz. can crushed tomatoes; ½ cup coarsely chopped cilantro; Buttered toast and lemon wedges (for serving)