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!
Foto: Just One Cookbook
Ingredients
- 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
Steps
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Gather all the ingredients. I use an electric pot for this recipe and others in the 10-Minute Meal series. You also could use a regular saucepan on the stove.
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Cut ¼ onion into thin slices.
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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.
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Cut 2 mushrooms into thin slices. Cut 2 Japanese sausages diagonally about ¼ inch (6 mm) thick.
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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.
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Add the sausages and onion and stir-fry until they are slightly tender and charred. Stir frequently since the pot heats up really fast.
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Add 2 cups water and bring it to a boil. You can cover the pot with a lid so the water boils faster.
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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.
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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.
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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.
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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 pasta water as possible.
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Add ½ Tbsp unsalted butter (optional) and combine well.
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Add 3 Tbsp ketchup, 1 tsp Worcestershire sauce, and freshly ground black pepper.
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Combine well and add up to ¼ tsp salt, to taste.
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Serve immediately and enjoy! This recipe is best consumed as soon as you prepare it, so I don’t recommend keeping leftovers.
Nutrition Facts (per serving)
Macronutrients
*DV = Daily Value based on a 2,000 calorie diet
💰 Cost Estimate
📋 Price Breakdown (8% ingredients detected)
| Ingredient | Amount | Unit Price | Subtotal |
|---|---|---|---|
| onion | 0.25 | - | - |
| reen bell pepper | 0.25 g | - | - |
| mushrooms | 2 | - | - |
| Japanese sausages | 2 | Rp 15.000/350ml | Rp 7.143 |
| extra virgin olive oil | 1 tbsp | - | - |
| water | 2 cups | - | - |
| spaghetti | 4 oz | - | - |
| unsalted butter | 0.5 tbsp | - | - |
| Diamond Crystal kosher salt | 0.5 tsp | - | - |
| ketchup | 3 tbsp | - | - |
| Worcestershire sauce | 1 tsp | - | - |
| freshly ground black pepper | - | - | - |
*Estimated market prices, may vary by region


















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