Heat olive oil in a saucepan over medium heat. Add onion and garlic; sauté until translucent and fragrant, about 3–4 minutes.
Pour in the gold tomatoes and broth. Stir, bring to a gentle simmer.
Add sugar (if using), salt, pepper, and red pepper flakes. Simmer 10–15 minutes, stirring occasionally, until the sauce thickens slightly.
Taste and adjust seasoning. If too acidic, a tiny pinch more sugar works wonders.
Turn off heat. Stir in chopped fresh basil or parsley. The sauce should be bright and glossy.
Serve immediately over warm pasta, or cool and store for later glory.