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HEAT grill to low heat.
BROWN meat in large skillet on medium-high heat; drain. Stir in spaghetti sauce and steak sauce; cook until heated through, stirring frequently.
MEANWHILE, divide pizza dough in half; shape each piece into 8-inch round. Brush evenly with half the oil. Place pizza rounds, oil-sides down, directly on grate of grill. Cook 5 to 7 min. or until bottoms of crusts are golden brown. Brush tops with remaining oil; turn over.
TOP pizzas with with meat mixture, cheese, tomatoes, onions and olives; cover grill with lid. Grill 5 to 7 min. or until bottoms of pizzas are golden brown and cheese is melted.