This zucchini miso black pepper pasta is a quick, umami-packed weeknight dinner that turns humble ingredients into a silky, flavorful sauce. The zucchini is cooked down until tender, then blended with white miso, butter, and a generous amount of freshly cracked black pepper to create a creamy coating for spaghetti. It’s a Japanese-Italian fusion that’s both comforting and surprisingly light, perfect for when you want something satisfying without a heavy cream sauce.
Ingredients
- 12 oz (340 g) spaghetti or other long pasta
- 2 tablespoons (30 g) unsalted butter, divided
- 1 lb (450 g) zucchini (about 2 medium), trimmed and cut into 1-inch chunks
- 1 small onion, chopped (about 1 cup / 150 g)
- 3 cloves garlic, minced
- 3 tablespoons (45 g) white miso paste
- 1 cup (240 ml) reserved pasta water, plus more as needed
- 1 teaspoon freshly ground black pepper, plus more for serving
- 1/2 cup (50 g) grated Parmesan cheese (optional, for serving)
- Salt, to taste (be careful, miso is salty)
Instructions
- Bring a large pot of salted water to a boil. Add the spaghetti and cook according to package directions until al dente. Reserve 1 cup (240 ml) of the pasta water, then drain the pasta.
- While the pasta cooks, melt 1 tablespoon (15 g) of the butter in a large skillet over medium heat. Add the zucchini and onion, and cook, stirring occasionally, until the zucchini is very soft and starting to brown, about 8–10 minutes. Add the garlic and cook for 1 minute more.
- Transfer the zucchini mixture to a blender. Add the miso paste, 1/2 cup (120 ml) of the reserved pasta water, and the black pepper. Blend until completely smooth, scraping down the sides as needed. The sauce should be thick but pourable; if too thick, add more pasta water a tablespoon at a time.
- Return the blender contents to the skillet. Add the remaining 1 tablespoon (15 g) of butter and stir over medium-low heat until the butter is melted and the sauce is heated through.
- Add the drained pasta to the skillet and toss to coat evenly with the sauce. If the sauce seems too thick, add a splash of pasta water to loosen it. Taste and add salt only if needed (miso is quite salty).
- Serve immediately, topped with grated Parmesan and an extra crack of black pepper if desired.
Tips
- Substitutions: If you don’t have white miso, yellow or red miso will work, but they are stronger in flavor—use about 2 tablespoons instead of 3. For a vegan version, replace the butter with olive oil and skip the Parmesan.
- Blending safety: When blending hot liquids, remove the center cap of the blender lid and cover with a towel to let steam escape. Start on low speed and gradually increase to avoid splattering.
- Common mistake: Overcooking the zucchini will make it watery, but undercooking will leave a grainy texture. Cook until it’s very soft and slightly caramelized for the smoothest sauce.
- Make it creamy without dairy: If you want a richer sauce, add 2 tablespoons of heavy cream or a dollop of crème fraîche after blending—just warm it gently without boiling.
Serving Suggestions
This pasta is delicious on its own, but it pairs well with a simple green salad dressed with lemon vinaigrette, or with grilled chicken or shrimp for extra protein. For a vegetarian meal, serve with crusty bread to mop up the sauce.
Variations
- Add greens: Stir in a handful of baby spinach or arugula after tossing the pasta with the sauce—the residual heat will wilt them.
- Spicy kick: Add a pinch of red pepper flakes or a drizzle of chili oil when serving.
- Zucchini noodles: For a low-carb option, replace the spaghetti with zucchini noodles (spiralized). Sauté them lightly and toss with the sauce without cooking them too long to avoid sogginess.
- Herb boost: Finish with fresh basil, parsley, or chives for a pop of color and freshness.
Storage and Reheating
Store leftovers in an airtight container in the refrigerator for up to 3 days. The sauce will thicken as it sits; when reheating, add a splash of water or pasta water to loosen it. Reheat gently in a skillet over medium-low heat or in the microwave in 30-second intervals, stirring in between, until hot. Avoid boiling, as the miso flavor can become bitter if overheated.
Frequently Asked Questions
Can I use a different type of pasta? Yes, any long pasta like linguine, fettuccine, or bucatini works well. Short shapes like penne or rigatoni also work, but adjust the cooking time accordingly.
Do I need to peel the zucchini? No, the skin is tender and adds color and nutrients. Just wash it well and trim the ends.
Can I make the sauce ahead of time? Yes, you can blend the sauce up to 2 days in advance and store it in the refrigerator. Reheat gently before tossing with freshly cooked pasta.
What if I don’t have a blender? You can mash the cooked zucchini with a potato masher or fork, but the sauce won’t be as smooth. Alternatively, use an immersion blender directly in the skillet.
Is miso paste gluten-free? Traditional miso is made from soybeans and rice or barley, so it may contain gluten. Look for a gluten-free label if you need it to be gluten-free. The pasta itself should also be gluten-free.
Can I freeze this dish? The sauce freezes well for up to 2 months, but the pasta will become mushy after thawing. Freeze the sauce separately, then cook fresh pasta to serve.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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