Pasta Shells with Gorgonzola and Walnuts | Share the Pasta

Ingredients

• 8 oz medium shells
• 1/4 cup walnuts, coarsely chopped
• 2 tbsp butter
• 1 small red onion, thinly sliced
• 1/2 cup celery hearts (tender, less fibrous center of a celery bunch), chopped
• 6 oz Gorgonzola “dolce” cut in 1” pieces
• salt to taste (for pasta water and sauce)
• 1/2 tsp cracked black pepper or totaste
• 1/2 cup pasta water
• 4 tbsp Parmigiano Reggiano, grated
• 2 tbsp Italian parsley, finely chopped