Preheat a 12 inch skillet or saute pan with 1 tablespoon olive oil over medium heat. Add onions and cook until soft.
Add dry pasta, sliced tomatoes, fresh whole basil leaves, garlic, water, salt and pepper. Stir together to combine.
Bring pasta mixture to a boil. Continue to cook pasta over medium heat, stirring often, until pasta is cooked and the liquid is reduced; about ten minutes.
Top evenly with mozzarella cubes and cover the pan so the cheese can melt.
Sprinkle with Balsamic vinegar and chopped basil for garnish.
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