Slow-Cooked Beef Barbacoa Tacos with Pickled Red Onions

By AislePrompt Editorial · Published 2026-05-20 · Updated 2026-05-20

Tender, slow-cooked beef barbacoa seasoned with earthy spices and served in warm corn tortillas with tangy pickled red onions for a festive Cinco de Mayo taco. This Mexican-inspired Cinco de Mayo recipe, ready in about 500 minutes, pairs beef chuck roast, chipotle peppers in adobo sauce, apple cider vinegar for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 450 calories and feeds 6, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 2 lbs, cut into 3-inch chunks beef chuck roast
• 2 peppers, minced chipotle peppers in adobo sauce
• 1/4 cup apple cider vinegar
• 4, minced garlic cloves
• 2 tsp ground cumin
• 1 tsp dried oregano
• 1/4 tsp ground cloves
• 1 cup beef broth
• 1 1/2 tsp salt
• 1 tsp black pepper
• 12 corn tortillas
• 1 medium, thinly sliced red onion
• 1/2 cup white vinegar
• 1 tbsp sugar
• 1/2 cup water
• 1/4 cup, chopped fresh cilantro
• for serving lime wedges

The slow cooker we’d leave this in all day → Best Slow Cookers in 2026: Top Picks + Buying Guide

Instructions

1. Step 1: In a slow cooker, combine 2 lbs beef chuck roast chunks, 2 minced chipotle peppers in adobo sauce, 1/4 cup apple cider vinegar, 4 minced garlic cloves, 2 tsp ground cumin, 1 tsp dried oregano, 1/4 tsp ground cloves, 1 cup beef broth, 1 1/2 tsp salt, and 1 tsp black pepper. Stir to coat the beef with spices.
2. Step 2: Cover and cook on low for 8 hours until the beef is tender and shreds easily. Remove beef and shred with two forks, then return to the slow cooker and mix with cooking liquid.
3. Step 3: For pickled red onions, combine 1/2 cup white vinegar, 1 tbsp sugar, and 1/2 cup water in a small bowl, stirring until sugar dissolves. Add 1 thinly sliced medium red onion and let sit at least 30 minutes.
4. Step 4: Warm 12 corn tortillas in a dry skillet over medium heat for about 20 seconds each until pliable.
5. Step 5: Assemble tacos by placing shredded barbacoa beef on each tortilla, topping with pickled red onions and 1/4 cup chopped fresh cilantro. Serve with lime wedges for squeezing.