Slow Cooker Root Vegetable Stew

Bahan-bahan (4 porsi)

• 1 large white onion OR 2 leeks (white portion only), chopped
• 1 lb . butternut squash, peeled, seeded and chopped
• 1 lb . carrots, peeled and chopped
• 1 lb . parsnips, peeled and chopped
• 1 lb . sweet potatoes, peeled and chopped
• 1 lb . Yukon Gold potatoes, peeled and chopped
• 2 celery ribs, stems removed and chopped
• 6 cloves garlic, peeled and thinly sliced
• 3 cups chicken or vegetable broth
• 1 bay leaf
• 1 Tbsp . fresh sage leaves, finely chopped
• 1 tsp . freshly-cracked black pepper
• 1/2 tsp . sea salt
• 2 cups chopped fresh kale
• optional: fried sage leaves for garnish (see note below)