01 -
1/3 cup of butter, chopped into five chunks.
02 -
About 3 1/2 cups yellow onions, diced (2 medium ones).
03 -
6 garlic cloves, finely chopped (2 tablespoons).
04 -
1/3 cup plain flour.
05 -
Four cups of unsalted chicken stock.
06 -
Two 28-ounce cans of San Marzano whole tomatoes.
07 -
Three basil sprigs (13 g) and some more chopped for garnish.
08 -
A 4-inch chunk of parmesan rind.
09 -
Sugar to taste, about 2 teaspoons.
10 -
Salt with freshly cracked black pepper.
11 -
Optional: Some creamy heavy cream for serving.