Slow-Cooked Beef Barbacoa Tacos with Pickled Red Onion

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

Tender, slow-cooked shredded beef richly seasoned with traditional Mexican spices served in warm corn tortillas topped with bright pickled red onions. This Mexican-inspired beef recipe, ready in about 260 minutes, pairs beef chuck roast, chipotle peppers in adobo sauce, garlic cloves, minced for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 420 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

• 3 lbs beef chuck roast
• 2 peppers + 2 tbsp sauce chipotle peppers in adobo sauce
• 4 garlic cloves, minced
• 2 tsp ground cumin
• 1 tsp dried oregano
• 1/4 cup apple cider vinegar
• 1 cup beef broth
• 1 1/2 tsp salt
• 1 tsp black pepper
• 1 large yellow onion, sliced
• 12 small corn tortillas
• 1 medium red onion, thinly sliced
• 1/2 cup white vinegar
• 1 tbsp sugar
• 1/2 cup water
• 1/4 cup cilantro, chopped
• 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: Place 1 medium thinly sliced red onion in a jar. In a small saucepan, combine 1/2 cup white vinegar, 1/2 cup water, and 1 tbsp sugar. Bring to a boil, pour over onions, and let sit at room temperature for at least 30 minutes.
2. Step 2: In a blender, combine 2 chipotle peppers in adobo, 2 tbsp adobo sauce, 4 minced garlic cloves, 2 tsp ground cumin, 1 tsp dried oregano, 1/4 cup apple cider vinegar, 1 cup beef broth, 1 1/2 tsp salt, and 1 tsp black pepper. Blend until smooth.
3. Step 3: Place 3 lbs beef chuck roast and 1 large sliced yellow onion in a slow cooker. Pour the blended sauce over the beef.
4. Step 4: Cook on low for 8 hours or on high for 4 hours until beef is tender and shreds easily.
5. Step 5: Remove beef and shred with two forks. Return shredded beef to the slow cooker and stir to coat with sauce.
6. Step 6: Warm 12 small corn tortillas on a dry skillet over medium heat for 30 seconds per side.
7. Step 7: Assemble tacos by placing shredded beef on tortillas and topping with pickled red onions and 1/4 cup chopped cilantro. Serve with lime wedges.