Step 1

In a large skillet or saucepan, heat the olive oil over medium heat.

Step 2

Add the chopped onion and sauté for 5–7 minutes, stirring occasionally, until softened and translucent.

Step 3

Stir in the minced garlic and cook for 1–2 minutes until fragrant.

Step 4

Add the crushed San Marzano tomatoes to the skillet, stirring to combine.

Step 5

Add kosher salt, black pepper, oregano, and red pepper flakes (if using).

Step 6

Stir in the red wine if using, and bring the sauce to a gentle simmer.

Step 7

Reduce the heat to low and simmer uncovered for 30–40 minutes, stirring occasionally, until the sauce thickens and the flavors meld.

Step 8

Taste the sauce and adjust the seasoning with more salt or pepper if needed.

Step 9

Stir in the chopped fresh basil just before serving for added freshness.

Step 10

Use the marinara sauce for pasta, pizza, or as a dipping sauce.