Easy Napolitan (Japanese Ketchup Spaghetti)
Learn how to make a Japanese family's favorite pasta, Easy Napolitan (Japanese Ketchup Spaghetti), using a single pot. Ready in 20 minutes, this quick version delivers comfort food with the convenience of one-pot cooking!

Ingredients
1 servings
Instructions
- Gather all the ingredients. I use an electric pot for this recipe and others in the 10-Minute Meal series. You could also use a regular saucepan on the stove.
- Cut ¼ onion into thin slices.
- Cut ¼ green bell pepper into thin strips. If your bell pepper is long, cut it in half widthwise first before cutting it into strips.
- Cut 2 mushrooms into thin slices. Cut 2 Japanese sausages diagonally about ¼ inch (6 mm) thick.
- Place all the ingredients on a tray or plate. Now, heat the pot on medium-high heat or Mode II (600W) on the electric pot. Add 1 Tbsp extra virgin olive oil.
- Add the sausages and onions and stir-fry until they are slightly tender and charred. Stir frequently since the pot heats up really fast.
- Add 2 cups water and bring it to a boil. You can cover the pot with a lid so the water boils faster.
- When boiling, add ¼ tsp salt. Break 4 oz spaghetti in half (so that it fits in the pot) and add to the boiling water.
- Make sure the pasta is submerged completely. Cook, uncovered, for 11 minutes.* * For Napolitan, we typically cook the pasta according to the package instructions or slightly longer instead of al dente.
- After 7 minutes have passed, add the bell peppers and mushrooms. We don't add them from the beginning so they don't get overcooked.
- After 10 minutes (1 minute left on the timer), reduce the heat to medium or Mode I (250W). Using a ladle, remove as much of the paste water as possible.
- Add ½ Tbsp unsalted butter (optional) and combine well.
- Add 3 Tbsp ketchup, 1 tsp Worcestershire sauce, and freshly ground black pepper.
- Combine well and add up to ¼ tsp salt, to taste.
- Serve immediately and enjoy! This recipe is best consumed as soon as you prepare it, so I don't recommend keeping leftovers.
Nutrition per serving
674kcal
💰 Cost Estimate
Total Ingredients
$710.00
$710.00
Per Serving
$710.00/serving
$710.00/serving
🏠 Savings
~$1420.00 vs buying!
~$1420.00 vs buying!
📋 Price Breakdown (92% ingredients detected)
| Ingredient | Amount | Subtotal |
|---|---|---|
| onions | 0.25 | $12.00 |
| Reen Bell Pepper | 0.25 g | - |
| mushrooms | 2 | $263.00 |
| Japanese sausages | 2 | $220.00 |
| extra virgin olive oil | 1 tbsp | $34.00 |
| water | 2 cups | - |
| spaghetti | 4 oz | $140.00 |
| unsalted butter | 0.5 tbsp | $8.00 |
| Diamond Crystal kosher salt | 0.5 tsp | $1.00 |
| ketchup | 3 tbsp | $28.00 |
| Worcestershire sauce | 1 tsp | $4.00 |
| freshly ground black pepper | - | - |
*Estimated market prices, may vary by region
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