Yup - used to do tomatoes in oil in the oven. I sliced mine. You can sprinkle them with herbs or chopped garlic, drizzle oil over and season. Cook slowly. Then I used to just leave them to cool and stick the whole pan in the freezer, then break them into pieces and put them in polythene bags then take out a chunk or two when I needed some for a recipe.
You can scoop out the seeds if you want to do halves, in which case you can put the insides and seeds in a jelly bag type thing to give you some pure clear intensely flavoured tomato juice. I usually used this when it was fresh. yum yum