Heat a large, wide, heavy casserole or deep, heavy skillet, or a large paella pan over medium-high heat. Once hot, add the bacon and cook until it begins to brown and has rendered some of its fat, about 3-4 minutes. Add the chorizo, cooking and breaking into smaller pieces for about 2 minutes, or until it begins to render its fat and darken in color.
Add the potatoes, 1 teaspoon of the salt, and ¼ teaspoon of the black pepper. Toss and cook for 3-4 minutes, so the potatoes begin to soften as the chorizo continues to cook and brown. Add the onion and cook for another 2-3 minutes, until it softens a bit. Add the chiles verdes and jalapeño, stir, and cook a couple minutes more. Add the garlic, stir, and cook for a minute. Add the tomatoes and chipotles, stir, and cook for another 3-4 minutes. With a slotted spoon or spider, remove all the cooked ingredients and scrape them into a large bowl.
Season the pork and beef tenderloin with the remaining ¾ teaspoon salt, ¼ teaspoon pepper, and cumin.
Set the same pan over high heat and add the vegetable oil. Once hot, add the pork and beef and brown on all sides, about 5 to 6 minutes. Add all of the chorizo-potato mix back to the pan, toss, and heat thoroughly. Serve with warm corn tortillas for people to tuck into tacos.