source: Mental Floss - world's best pasta sauce; easy to DIY

no-rabbit-hole recap: Combine 28oz can of whole peeled tomatoes; a peeled halved onion; 5 Tbsp butter; and 1-2 pinches salt of salt in a single pot and simmer uncoverred over medium heat 45 minutes, stirring occasionally. After 45 minutes, discard the onion halves and serve over your favorite pasta.