Add the olive oil and onion to a large skillet over medium heat. Cook while stirring for about 5 minutes until the onion softens but doesn’t brown.
Add the garlic and salt and stir for 1 minute until the garlic is fragrant.
Add the sugar, tomatoes, and water. Stir every few minutes while the sauce comes to a simmer.
Simmer the sauce for 15-20 minutes until reduced and thickened. Taste as you go and add more sugar and salt to your preference.
Use as you’d like. Enjoy!