All of this is done "to taste" and can easily be manipulated to suit your own preferences.
Tomato salsa (I like the really fresh stuff my grocery's deli makes)
Olive Oil (EVOO works, but what you have should be fine. Don't worry about getting the "really good" stuff)
Garlic Salt and Pepper OR steak seasoning in a grinder (lately, I've liked Weber Grill's Chicago Steak blend)
Mix and serve. I usually have 1 cup of salsa to 2 tablespoons of olive oil (I "eyeball" it). Pairs well with corn chips, pita chips, toast, stale french bread, etc. I suspect it would be good with fresh mozzarella too.
Perfect for when you want something fresh and tomato-y, but plain salsa won't cut it. No need to prepare anything in advance, heat anything, or refrigerate overnight. All you need is a container & spoon.