We tried this method for a recipe that called for 28 oz canned fire-roasted tomatoes: https://www.thekitchn.com/quick-tip-roasting-tomatoes-un-59853 We lined our rimmed baking sheet with foil. To maximize exposure to the flames in our gas oven broiler, we cut our Roma tomatoes in half lengthwise. For 28 oz canned, we substituted with 1 ½ lb Roma tomatoes (about 9 small to medium Romas). At 4 inches from the high broiler setting, these tomatoes were fire-roasted in less than 5 mins. We forgot to rotate the tray, which would have been helpful. (July 2018)
Cooking Adventures 