Trim the chicken breasts to remove any fat or cartilage. Cut against the grain into thin strips. Don't forget to ask an adult for help!
Whisk the onion, ketchup, soy sauce, sesame oil, brown sugar, garlic, jalapeño, lime juice, chili paste, ginger, and salt with 1 cup water in a glass bowl. Pour into a resealable plastic bag and add the chicken. Close, squeeze several times to distribute the marinade, and refrigerate for 1–12 hours.
Remove the chicken from the marinade and thread lengthwise onto 16 skewers. Pour the marinade into a small saucepan and reserve.
Prepare a grill for a hot fire. Grill the chicken on the first side until browned, about 2 minutes. Turn over and grill until cooked through, another 1 to 2 minutes.
Bring the marinade to a full boil.
Add the peanut butter and stir until smooth, thinning with water as necessary to give it a saucelike consistency. Serve the chicken satay with the sauce, garnished with the lime wedges. |