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MAKE THE SAUCE: Heat a heavy-based pot over medium-high heat. Warm 2 tbsp olive oil, then add in the chopped onion and sauté it for 5 minutes, until it is tender and beginning to brown. Add in the garlic and sauté for 1 more minute. Next, add in 1/4 tsp dried oregano, 1/4 tsp cinnamon, 3/4 tsp ground cumin, and 1/2 tsp black pepper. Toast the spices for 1-2 minutes, stirring constantly to avoid burning. Add a little more oil here if necessary. Next, stir in the vegetable stock, canned tomatoes, chipotle peppers, adobo sauce, and 1.5 tsp salt, and allow the sauce to cook for 3-4 minutes.