How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Slow-Cooker Barbecue-Beef Sandwiches?

You need 16 ingredients. The key ingredients include: 5 tablespoons dark brown sugar, divided, 3/4 teaspoon black pepper, 2 (1-pound) flank steaks, 1 cup chopped onion, and more.

Is Slow-Cooker Barbecue-Beef Sandwiches suitable as soups & stews?

Yes, Slow-Cooker Barbecue-Beef Sandwiches falls under the Soups & Stews category and is a great choice for this type of meal.

How do I store leftover Slow-Cooker Barbecue-Beef Sandwiches?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Slow-Cooker Barbecue-Beef Sandwiches Recipe

Name: Slow-Cooker Barbecue-Beef Sandwiches
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 5 tablespoons dark brown sugar, divided; 3/4 teaspoon black pepper; 2 (1-pound) flank steaks; 1 cup chopped onion; 1 cup tomato paste; 3 tablespoons Worcestershire sauce; 3 tablespoons molasses; 3 tablespoons cider vinegar; 1 tablespoon chili powder; 1 teaspoon garlic powder; 1 teaspoon dry mustard; 1 teaspoon ground cumin; 1/2 teaspoon salt; 10 (2 1/2-ounce) submarine rolls, halved; Red onion slices (optional); Dill pickle slices (optional)

Try this homemade Slow-Cooker Barbecue-Beef Sandwiches recipe the whole family will love. Made with brown sugar, black pepper, flank steaks and onion. E…

This Slow-Cooker Barbecue-Beef Sandwiches relies on simple, everyday ingredients such as dark brown sugar, divided, black pepper, (1-pound) flank steaks and chopped onion. It comes together quickly and makes 4 servings, at about 260 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It works as a light main on its own or as a starter alongside crusty bread, and it's just as good for a cozy night in as it is for feeding a crowd. Leftovers keep well, so it's a smart choice for meal prep too.

Updated Jun 30, 2026

Serves 4 Soups & Stews

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Brown sugar instead of white sugar adds a deeper, more caramel-like flavor.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Slow-Cooker Barbecue-Beef Sandwiches

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions