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 Vegan Portobello “Pot Roast”?

You need 16 ingredients. The key ingredients include: 8 portobello mushroom caps large, sliced 1 1/2-inch thick, 1 1/2 cups unsalted vegetable stock Kitchen Basics(R), 1 cup pearl onions frozen, 2 small carrots cut into 1-inch pieces, and more.

Is Slow Cooker Vegan Portobello “Pot Roast” suitable as meat & poultry?

Yes, Slow Cooker Vegan Portobello “Pot Roast” falls under the Meat & Poultry category and is a great choice for this type of meal.

How do I store leftover Slow Cooker Vegan Portobello “Pot Roast”?

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

Slow Cooker Vegan Portobello “Pot Roast” Recipe

Name: Slow Cooker Vegan Portobello “Pot Roast”
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 8 portobello mushroom caps large, sliced 1 1/2-inch thick; 1 1/2 cups unsalted vegetable stock Kitchen Basics(R); 1 cup pearl onions frozen; 2 small carrots cut into 1-inch pieces; 1/4 cup red wine; 3 tablespoons tomato paste; 1 tablespoon red wine vinegar; 1 tablespoon vegan Worcestershire sauce; Worcestershire sauce; 2 cloves garlic finely chopped; 1/2 teaspoon rosemary McCormick GourmetTM Organic, Crushed; 1/2 teaspoon sea salt Sicilian; 1/2 teaspoon thyme McCormick GourmetTM Organic; 1/4 teaspoon black pepper McCormick GourmetTM Organic, Coarse Ground; 2 tablespoons cornstarch; 2 tablespoons water

Try this homemade Slow Cooker Vegan Portobello “Pot Roast” recipe the whole family will love. Made with portobello mushroom, pearl onions, carrots and r…

This Slow Cooker Vegan Portobello “Pot Roast” relies on simple, everyday ingredients such as pearl onions frozen, red wine, tomato paste and red wine vinegar. It comes together quickly and makes 4 servings, at about 124 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 Meat & Poultry

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

Feel free to swap in similar ingredients you already have on hand and adjust seasoning to taste.

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

My Personal Notes

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Slow Cooker Vegan Portobello “Pot Roast”

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions