Slow Cooker Lamb Stew with Butternut Squash and Marsala Wine

Ingredients (16 items)

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• 1 pound cubed lamb stew meat
• ½ teaspoon salt, or more to taste
• ½ teaspoon ground black pepper
• 2 teaspoons butter
• 1 medium sweet onion, diced
• 1 medium shallot, diced
• 4 cloves garlic, minced
• 2 cups diced butternut squash
• 2 cups chopped white mushrooms
• 1 cup diced sweet potato
• 1 cup diced carrots
• 1 cup diced celery
• 2 cups beef bone broth
• 1 cup Marsala wine
• 4 sprigs fresh rosemary
• 4 sprigs fresh thyme, or to taste