Heat the avocado oil in a heavy-bottomed pot over medium heat and sauté the diced red onion, minced garlic, and grated ginger until they become fragrant and translucent.
Add the chicken breast pieces to the pot, seasoning them with sea salt and black pepper, and cook until the meat is lightly browned on all sides.
Stir in the tomato paste and tomato puree, ensuring the chicken is well-coated, then add the scotch bonnet pepper to infuse the stew with a subtle heat.
In a small bowl, whisk the natural peanut butter with 0.5 cup of the water until a smooth paste forms, then pour it into the pot.
Reduce the heat to low, cover the pot, and allow the stew to simmer for 20 minutes until the sauce has thickened into a velvety consistency and the chicken is tender.
While the stew is simmering, prepare the fufu by combining the cassava flour with the remaining 0.5 cup of water in a separate saucepan over medium heat, stirring vigorously until it forms a thick, stretchy dough.
Shape the warm cassava dough into a smooth, round ball and serve it immediately alongside the aromatic groundnut chicken stew.