Peel and dice the potatoes, trim the green beans, and chop the onion, garlic, and bell pepper.
Warm the olive oil in a large pot over medium heat and cook the potatoes for about 10 minutes, until lightly golden.
Add the green beans, bell pepper, onion, garlic, and seasonings. Let everything cook together for about 8 minutes, stirring occasionally.
Stir in the tomato puree, soy sauce, and water, then bring the stew to a gentle simmer.
Cover and let simmer until the vegetables are tender and the sauce has thickened.
Finish with fresh parsley and serve warm with crusty bread.