Stuffed tomatoes — tomates farcies — are a standard French preparation at the end of summer, when the tomato crop comes in. The stuffing is usually ground pork in the form of chair à saucisses (sausage meat), which is seasoned ground pork. They even sell farce à tomates (tomato stuffing) at the supermarket — that's ground pork seasoned with black pepper, garlic, and parsley.
What I used was saucisses de Toulouse with the casings removed. Toulouse sausages are just coarsely ground pork, seasoned with salt and pepper, stuffed into a natural casing. Because I needed more stuffing, I added a package lardons nature — salt-cured pork bacon, not smoked — which I chopped coarsely with a big knife. (You could substitute ground chicken or turkey for the pork.)
Here's the stuffing recipe I was following (loosely), from Marmiton, for six tomatoes*:
• 6 grosses tomates bien rouges, bien mûres
• une petite livre de chair à saucisses
• 250 g de champignons de Paris
• gros oignon
• 1 bouquet de persil
• du riz basmati
• un vin blanc sec
• sel, poivre
Chop the onion, parsley, and mushrooms finely and mix them into the ground pork. It's easy and fast to chop the mushrooms in a food processor, pulsing them several times to get the right texture. Season the pork with salt, pepper if it's not already seasoned. Substitute basil for parsley if you want. Optionally, add a teaspoonful of fennel seeds to the mixture.
Cut the top off the six tomatoes and use a paring knife and a small spoon to loosen up and scoop out the pulp and seeds, which you can put in a strainer over a bowl so that the tomato liquid drips through. Salt the inside of the tomatoes lightly and fill the tomatoes with the meat mixture. Set them in a baking dish, and put the tomato tops back on.
Pour the reserved tomato liquid and enough white wine into the pan so that you have about half an inch of liquid for the tomatoes to cook in. Puut the pan in a 350ºF/180ºC oven for 30 to 40 minutes.
At that point, spoon several tablespoons (½ to ¾ cup) of basmati or other rice into the cooking liquid in the baking dish. Mix it in evenly as best you can, and then put the dish back in the oven for 15 or 20 minutes more cooking. Adjust the oven temperature as necessary. When the rice is done, the tomatoes will be done too.
Not only do the supermarkets sell meat seasoned as tomato stuffing,
but they also sell stuffed tomatoes, ready-made.
* Here are the stuffing ingredients in English:
• 6 large ripe red tomatoes
• 1 lb. ground pork
• ½ lb. mushrooms
• 1 large onion
• 1 bunch parsley
• basmati rice
• dry white wine
• salt and pepper