Slow Cooker Cabbage & Onion Soup

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Slow Cooker Cabbage & Onion Soup

Slow Cooker Cabbage & Onion Soup is the ultimate set-it-and-forget-it comfort food. As the onions and cabbage slowly break down, they release their natural sugars, creating a deeply savory, slightly sweet, and rich broth that feels like French onion soup meets a cozy vegetable stew.
Here is how to make a wonderfully rich and aromatic batch in your crockpot:

1. Essential Ingredients

  • The Veggies: 1 large head of green cabbage (coarsely chopped or sliced into ribbons) and 3 large yellow onions (thinly sliced into half-moons for that classic onion-soup sweetness).
  • The Aromatics: 4 cloves of minced garlic, 2 bay leaves, 1 tsp dried thyme, and 1 tsp Worcestershire sauce (for that umami depth).
  • The Broth: 6 to 7 cups of rich beef broth (beef broth gives it a deep, savory color and flavor, though vegetable broth works great too).
  • The Fat: 3 tablespoons of butter, sliced into small pats to dot over the top.
  • The Optional Grand Finale: Slices of crusty French bread and a cup of Gruyère or Swiss cheese for a broiled cheesy topping.

2. Step-by-Step Instructions

  • Layer the Slow Cooker: Place your sliced onions and minced garlic at the bottom of the slow cooker insert, then pile the chopped cabbage right on top.
  • Season & Dot with Butter: Sprinkle the dried thyme, salt, and black pepper over the veggies, lay the bay leaves in the middle, and dot the top with the small pats of butter.
  • Add the Liquid: Pour the beef broth and Worcestershire sauce evenly over the entire mixture.
  • Time & Temperature: Cover and cook on LOW for 6 to 8 hours (or HIGH for 4 hours) until the onions are meltingly soft and the cabbage has completely tenderized into the broth.

💡 Pro-Tip

To turn this into a French Onion-style Cabbage Soup, ladle the hot soup into oven-safe bowls, top each with a slice of crusty toasted bread and a generous handful of Swiss or Gruyère cheese, and place them under your oven’s broiler for 2–3 minutes until the cheese is bubbling and golden brown!
Are you keeping this as a light, brothy vegetable soup, or are you planning to serve it with crusty bread and cheese on top?

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