In a large deep fry pan, bring the olive oil to heat. Turn the heat to low, add the crushed garlic and cook for 2 - 3 minutes or until the garlic is fragrant and soft. Stir the garlic quite often to ensure it does not burn. If you are after a more mild garlic flavour, add the garlic as whole cloves and cook for 2 - 3 minutes or until they begin to slightly brown. With a slotted spoon, remove the garlic from the olive oil and set to the side.
If using whole tinned tomatoes, squeeze the tomatoes with your hand to slightly puree them.
In the same pan, combine the tinned tomatoes, water, a pinch of salt and pepper and ¾ of the basil. Bring to the boil then turn the heat all the way down and leave to simmer for 30 - 40 minutes. Depending on the tinned tomatoes you are using, your sauce may need a little sweetness. Keep tasting your sauce as it cooks and add more salt or pepper if needed.
Divide into portions of your choice and serve with pasta or one of my suggested recipes.