How to cook vegetable stew without oil

Oil-free vegetable sauce.

Ingredients:
3 red bell peppers (Tatashe)
4 medium tomatoes
1 medium onion
1 medium smoked fish(any fish will do)
1 medium bunch of spinach or green
2-3 boiled eggs, optional (you can use beef instead)
2 cloves of garlic.
1 small ginger, optional
1 tablespoon ground crayfish
2-3 scotch bonnet peppers (Ata Rodo)
1-2 two seasoning cubes
Salt to taste

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