Remove any stems and slice the tomatoes in half horizontally. Note: if your tomatoes are very small you can just slice the top off rather than cutting in half.
Scoop out a little indentation in each one. I use a grapefruit knife to chisel out just a bit of the flesh to make room for the gratin topping. Sprinkle with sea salt and fresh cracked pepper.
Toss together bread crumbs, cheese, garlic, shallot, herbs, and a mix of butter and olive oil to make the cheesy gratin topping.
Sprinkle the mixture generously over each tomato. Bake for 15 minutes. I often change from bake to broil for the last minute or so to get a little more color on the gratin.
Serve asap. Leftovers can be reheated in a low 300F oven, or in the microwave.
Notes
*To make fresh bread crumbs break apart bread and place in the food processor. Process until evenly ground and fluffy. You can do this with regular white bread, artisan bread, or a baguette style loaf. The bread can be fresh or day-old. For more info see my post on making your own breadcrumbs.This post was first published in 2012, and was re-tested, tweaked, and rephotographed in 2024.