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When the chicken breasts are ready, take them out of the grill and put bell pepper and mushrooms on the grill, press them tight with the grill top for 1-1.5 min. When they are ready, take them off the grill and put tomatoes on the grill, press them slightly with the top grill for 1 min. Turn off the grill.
Serve within 30 min since it is ready.