Marcella Hazan’s Famous Tomato Sauce | Micah Meals | Umami

Ingredients

• 1 (28-ounce) can whole San Mariano tomatoes, no salt or herbs added (highest quality) or 2lbs of ripe tomatoes blanched peeled and cored
• 70g unsalted butter (5 tbsp)
• 1 small white or yellow onion, peeled and cut in half
• 1 tsp Kosher salt and more to taste