1 cup catsup
1 cup firmly packed brown sugar
3/4 cup cider vinegar
2 tablespoons grated orange peel
4 tablespoons (1/4 cup) freshly squeezed
orange juice, divided
1/2 cup finely chopped onion
2 tablespoons soy sauce
1 tablespoon cornstarch
Combine all ingredients except 2 tablespoons of the orange juice and the cornstarch. Bring to a boil over medium-high heat. Reduce heat and simmer, uncovered, for 25 minutes; stir occasionally.
Mix cornstarch with remaining 2 tablespoons of the orange juice until smooth; stir into sauce. Increase temperature to medium-high. Bring to a boil, stirring constantly, until sauce thickens. Brush sauce on grilled chicken, steak or fish during last 5 minutes of grilling.