Bigoli with Onion-Anchovy Sauce - SippitySup

Ingredients

• ¼ cup olive oil
• 4 tablespoons unsalted butter
• 1 large onion halved and thinly sliced
• 3 cloves garlic peeld and chopped
• 1 big pinch kosher salt plus more for pasta water
• 1 ounce canned anchovy fillets drained and finely chopped
• 1 cup chicken stock
• ½ teaspoon ground black pepper or more to taste
• 1 pound fresh bigoli or other spaghetti-like whole wheat pasta
• ¼ cup flat leaf parsley finely chopped