METHOD
Scoop out seeds from tomatoes, and if it is large, cut tomatoes in quarters.
Place onto trays, flesh side up and sprinkle liberally with sea salt.
Roast tomatoes for 2½ hours or until the edges are just starting to look charred and the tomatoes are still soft and pliable.
Check tomatoes every half hour after the first 1½ hours of cooking.
Remove tomatoes from oven and cool completely.
Place into a large preserving jar or sealable container and pour over enough olive oil to cover.