Cut tempeh into three to four strips and pulse in a food processor until chopped to a very coarse meal texture, or process through a meat grinder, fitted with the coarse blade.

Place a 2-quart saucepan over high heat and add coconut oil. When completely melted, add onion and stir until softened. Add ground tempeh and stir until mixture is dry and begins to stick. Add chopped tomatoes, stirring to loosen any bits from pan bottom. Stir in chili powder, salt to taste, and bring to a boil. Reduce heat to maintain a steady simmer, cover, and cook for about 10 minutes.

If using masa harina, combine with about ¼ cup cold water to form a thin, watery paste and add to chili. Stir to combine well and cook for about 2 minutes, until mixture thickens slightly. Drain beans thoroughly and add to chili. Warm through and serve