Japanese Napolitan Spaghetti
Quick answer
- Total time
- 30 min
- Level
- Easy
- Servings
- 2 servings
- Ingredients
- 8
About this dish
Napolitan spaghetti is a Japanese yoshoku pasta stir-fried with ketchup, sausage, onion, and green bell pepper that traces its origins to postwar Japan, when imported ingredients were scarce and cooks adapted Western techniques with locally available pantry staples.
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Cooking the ketchup in the pan first drives off moisture and concentrates its tomato sweetness, transforming it from a condiment into a sauce base with genuine depth. Worcestershire sauce adds a layer of fermented complexity that ketchup alone cannot provide. The sausage goes in first to render its fat and build flavor, followed by onion and pepper stir-fried quickly over high heat to retain their texture. Spaghetti cooked al dente with a quarter cup of pasta water reserved helps the sauce cling to the noodles when tossed together in the pan. A knob of butter stirred in at the end rounds off the ketchup's acidity and gives the finished dish a glossy, sweet-savory character that has made napolitan a beloved nostalgic dish in Japanese home cooking.
Ingredients
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Instructions
Read the steps as a cooking flow: prep, heat, seasoning, doneness control, and finish.
- 1Finish
Cook 180 g spaghetti in boiling salted water until al dente, so the center still has a slight bite.
Before draining, reserve 1/4 cup of the pasta water for loosening the sauce later.
- 2Heat
Slice 100 g onion and 80 g green bell pepper into thin strips, and cut 120 g sausage on the diagonal.
Shake off excess moisture before stir-frying so the vegetables sear instead of steaming.
- 3Control
Heat a pan over medium-high heat, add 1 tbsp cooking oil, and stir-fry the sausage for 2 to 3 minutes.
When the edges turn lightly browned and aromatic, the pan is ready for the vegetables.
- 4Control
Add the onion and green bell pepper, then stir-fry over high heat for only 1 to 2 minutes.
Stop while the onion is just translucent and the pepper still has a crisp texture.
- 5Season
Lower the heat to medium, add 4 tbsp ketchup and 1 tbsp Worcestershire sauce, and cook for 1 to 2 minutes.
Stir constantly until the sauce darkens slightly, looks glossy, and the sharp acidity softens.
- 6Finish
Add the cooked spaghetti and toss while adding the reserved pasta water a little at a time, just until the sauce coats the noodles.
Melt in 1 tbsp butter at the end for gloss and a smoother finish.
Practical Cooking Checks
The cues that matter most while cooking.
- Key technique
- Japanese yoshoku pasta stir-fried with concentrated ketchup, sausage, and green peppers.
- Finish cue
- Add the cooked spaghetti and toss while adding the reserved pasta water a little at a time, just until the sauce coats the noodles.
Cooking decision evidence
Calculated Charim data and applicable official cooking and food safety guidance.
This recipe
30min, 8 ingredients
Category median
35min, 9 ingredients
Based on 109 recipes
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