It is always a good idea to have this garnish because it can come in handy with other different recipes (rice, pasta, fish, meat, poultry, etc...). You may keep these tomatoes in the fridge for a while without any problem.
Remove the tomatoes from the oven and let them cool. Then use a spatula to pile the tomatoes up inside a big jar. Cover them with olive oil and place them in the refrigerator. You may taste the results 3 days after, yum yummy !!!!