Napolitan Spaghetti

Ingredients

• 1 lb. spaghetti
• 2 tbsp. unsalted butter
• 1⁄4 lb. white button mushrooms, trimmed and thinly sliced
• 1 medium yellow onion, thinly sliced
• 1⁄4 lb. cooked ham, cut into ¼"-thick strips about 2" long
• 1⁄4 lb. long beans or regular green beans, trimmed and cut into 2" pieces
• 1⁄4 cup milk
• 1⁄4 cup sake
• 5 tbsp. ketchup
• 1 tsp. paprika
• Kosher salt
• freshly ground black pepper
• 1⁄4 cup grated parmesan cheese
• Tabasco, for serving (optional)