3/4 cup roasted and shelled peanuts

2 tablespoons peanut or neutral oil, like grapeseed or corn

1 medium red or white onion, chopped

1 tablespoon minced fresh ginger

1 tablespoon minced garlic

1/2 pound skinless, boneless chicken (about 2 thighs or breasts) cut into chunks

Pinch of cayenne

Salt and freshly ground black pepper

6 cups stock or water

2 sweet potatoes or yams (about 1 pound), peeled and cut into thick slices

8 plum tomatoes, cored and halved (canned are fine; drain and reserve liquid for another use)

1/2 pound collards or kale, washed and cut into wide ribbons

1/4 to 1/2 cup peanut butter, chunky or smooth.