Step 1

Make the pickled onions: Squeeze lime juice into a bowl, and add onion, salt and sugar. Let rest while you make the chili.

Step 2

Prepare the chili: Heat a large skillet over medium-high. Add the oil. When hot, add onion and sauté until softened, 5 to 7 minutes. Add garlic, chile powder and oregano and sauté until fragrant, 1 to 2 minutes longer. Add beans and tomatoes and a few large pinches of salt and let simmer until the tomatoes break down, about 20 minutes.

Step 3

Taste and add more salt, chile powder and/or oregano to taste. Serve with the pickled onions and any of the garnishes you like.