Easy Napolitan (Japanese Ketchup Spaghetti)

Bahan-bahan (1 porsi)

• ¼ onion
• ¼ g reen bell pepper
• 2 mushrooms
• 2 Japanese sausages
• 1 Tbsp extra virgin olive oil ((or any neutral oil))
• 2 cups water
• 4 oz spaghetti
• ½ Tbsp unsalted butter ((optional))
• ½ tsp Diamond Crystal kosher salt ((divided))
• 3 Tbsp ketchup
• 1 tsp Worcestershire sauce
• freshly ground black pepper