Step-by-Step Instructions
Step 1 - Prep All the Vegetables
The 20-minute prep covers everything that needs cutting before loading the slow cooker:
Dice the onion into roughly ½-inch pieces
Mince the garlic - 3 cloves, minced fine
Dice the red bell pepper - remove seeds and core, then dice
Dice the sweet potatoes - scrub, then cut into consistent ¾-inch cubes. This size is specifically chosen to ensure the sweet potatoes cook through completely during the 3-4 hour HIGH setting without becoming mushy.
Cut the green beans - trim ends and cut into 1–2 inch pieces
Chop the fresh rosemary - strip the leaves from the stems and chop finely
Step 2 - Load the Slow Cooker
Add everything to the slow cooker in one go the diced onion, minced garlic, diced bell pepper, sweet potato cubes, green bean pieces, drained cannellini beans, vegetable broth, tomato paste, soy sauce, chopped fresh rosemary, smoked paprika, and cayenne pepper.
Do not add salt, pepper, or hot sauce at this stage. Salt specifically should wait until after cooking adding it early to a stew with beans can affect how the beans cook and may make the finished stew taste slightly over-salted as the liquid reduces during the long cook. Season at the end with full control over the final flavor.
Stir everything together thoroughly until the tomato paste and soy sauce distribute evenly through the broth and vegetables. The broth will look rich and dark from the tomato paste that's exactly right.
Step 3 – Cook Low and Slow
Cover the slow cooker and cook on HIGH for 3–4 hours or LOW for 5–6 hours. The stew is finished when the sauce has thickened considerably, the sweet potatoes are completely soft when pierced with a fork, and the green beans are tender throughout.
Don't lift the lid during cooking unless you need to check the liquid level in the final hour each lid removal releases steam and adds 15–20 minutes to the effective cook time. Trust the slow cooker.
As the sweet potatoes cook through, some of them naturally break down and release starch into the surrounding broth. This is what creates the stew's thick, almost velvety consistency by the end of the cook no flour, no cornstarch, no additional thickening agents required. The sweet potatoes do it naturally.
Step 4 - Season and Serve
Turn off the slow cooker. Give the stew a thorough stir from the bottom up. Taste and season with salt, black pepper, and hot sauce to taste. The soy sauce and tomato paste already contribute significant saltiness start with a small amount of additional salt and build from there.
Ladle into bowls and serve immediately while hot.
