1. Bring first 13 ingredients and 1 cup water to a boil in a large Dutch oven over medium-high heat. Reduce heat to medium-low, and cook, stirring occasionally, 20 minutes or until vegetables are tender. Serve vegetable mixture using a slotted spoon with warm tortillas and desired toppings.
Note: Nutritional analysis is per taco with flour tortilla and 1/2 cup vegetable mixture (not including toppings).