I don't really have a "recipe" for this, it's more of just a "dump" thing, but figured I'd write it down anyway :)
Mozzarella cheese, cubed ("fresh" mozarella is best but the normal grocery store variety will work if you're on a budget)
tomatoes, chopped into biggish chunks (think similar size to the cheese cubes)
Fresh basil, cut into strips
Mix all together, pour a little olive oil and some salt, stir it gently together. Chill.