This recipe can easily be increased. The important thing is to use a baking dish or pan big enough so that they tomatoes are not too crowded. You want room between them for the moisture to escape, which concentrates the tomato flavor. If you use a metal pan, make sure it’s not aluminum or made of another material that might react with the acidic fruits.
And it’s up to you if you want to cut out the stems before roasting or not. You can see here I did some, but not the others (for whatever reason was running through my mind at the time.) The herbs can vary as well; basil, oregano, or marjoram all pair nicely with tomatoes.
Storage: The tomatoes will keep for about five days in the refrigerator. They can also be frozen for up to six months.