Chef John's Chicken Spaghetti

By Chef John

4.47 / 5

20min

2h 05min

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1 (4.5 pound) whole chicken giblets removed
1 (24 ounce) jar marinara sauce
6 cups water
2 anchovy fillets
½ teaspoon red pepper flakes or to taste
2 teaspoons salt plus more to taste
1 (16 ounce) package spaghetti
¼ cup basil leaves thinly sliced
½ cup grated Pecorino Romano cheese
1 tablespoon cold butter
1 tablespoon grated Pecorino Romano cheese