Kare Kare Oxtail Stew

Name: Kare Kare (Oxtail Stew)
Ingredients: 3 pounds oxtail, cut into 2-inch pieces; 1 large onion, chopped; 1/2 teaspoon kosher salt + more to taste; 1 pound honeycomb tripe (optional; see Note); 1/2 cup annatto seeds soaked in a 1/2 cup hot water; 1 cup roasted, unsalted peanuts, finely ground; 1/2 cup peanut butter; Half of a 2-pound kabocha squash, seeded and cut into 1-inch pieces (unpeeled); 1 small banana blossom (canned is fine), chopped into 2-inch pieces (see Notes); Pepper to taste; 1 pound baby bok choy, quartered or halved lengthwise and washed well; 1/2 pound Asian string beans or green beans, cut into 2-inch pieces; 2 Asian eggplants, about 1 pound, sliced about 1/2-inch thick; Bagoong or sauteed Philippine shrimp paste, for serving (see Notes); Cooked rice, for serving