Combine peanut butter and tomato paste in a bowl. Add 2-3 tbsp water to get a saucy consistency. Set aside.
Heat 1tbsp oil in a pan, add ginger and garlic and cook until they are fragrant. Next add onions and cook until translucent, about 3-4 minutes.
Next add sweet potato and coconut milk (or just use 1 cup of water or vegetable broth), bring to a boil and cover and simmer until sweet potato is just tender, about 8-10 minutes.
Next add the chopped greens and cook until they are wilted, about 3-4 minutes.
Add the peanut butter-tomato paste slurry, curry powder, sriracha sauce, salt and pepper. Add water if the curry looks too thick. Simmer for 5 minutes for all the flavors to mingle.
Serve hot with brown rice, quinoa or a chunk of bread.