This is a creamy pasta dish built around a blended cashew sauce, smoky tempeh, and a pinch of black salt that genuinely mimics the eggy depth of the original. It comes together in about 30 minutes and holds up well for a weeknight dinner. People who don’t normally eat plant-based tend to go back for seconds — the sauce is that satisfying.
What makes this version work
Two things actually matter here. First, the cashews need to be fully soaked — at least four hours, ideally overnight — before blending. Under-soaked cashews leave the sauce grainy no matter how long you run the blender, and a grainy sauce won’t coat the pasta the way it should. Second, black salt (kala namak) is doing real work in this recipe. It has a sulfurous, egg-like flavor that nutritional yeast alone can’t replicate. Without it, the sauce tastes good but generic. With it, the dish reads as carbonara to people who know the original. Both ingredients are easy to find online or at South Asian grocery stores, and neither is expensive.
About the ingredients
- Black salt (kala namak): This is a pink-gray Himalayan mineral salt with a strong sulfur smell straight from the bag — that’s normal. The smell mellows once it hits warm food. Don’t substitute regular salt or smoked salt; neither has the same effect.
- Smoked tempeh: If you can only find plain tempeh, add a teaspoon of smoked paprika and a few drops of liquid smoke to the marinade before pan-frying. It gets you most of the way there. Vegan bacon strips work as a direct swap if you want to skip the tempeh entirely.
- Nutritional yeast: Adds savory, cheesy background flavor. Fortified varieties also contribute B12. Store it in a sealed container away from light — it goes stale faster than most people expect.
- Unsweetened almond milk: Any plain, unsweetened plant milk works. Oat milk gives a slightly thicker result; soy milk is the most neutral. Avoid anything vanilla-flavored.
Storage and reheating
Store leftovers in an airtight container in the fridge for up to three days. The sauce thickens considerably as it sits because the cashews continue to absorb moisture from the pasta. To reheat, add a splash of water or plain plant milk — start with two tablespoons per serving — and warm it in a skillet over medium-low heat, stirring until the sauce loosens and coats the noodles again. Microwaving works in a pinch but tends to make the tempeh chewy rather than crisp; a quick 60 seconds in a dry pan after microwaving fixes that. This dish does not freeze well — the cashew sauce separates on thawing and doesn’t fully come back together even with stirring.
Mistakes to avoid
- Adding the sauce to a dry pan: The cashew sauce scorches quickly over direct heat. Always toss it with the pasta off the heat or in a pan you’ve pulled from the burner, using residual warmth to bring everything together.
- Overcrowding the tempeh: If the cubes are packed too tightly in the pan, they steam instead of crisping. Cook them in a single layer with space between pieces, and don’t stir too early — let them develop a crust before flipping.
- Skipping the pasta water: Reserve at least half a cup before draining. The starchy water is the only reliable way to thin the sauce without diluting its flavor, and you’ll almost certainly need it.
- Over-salting before tasting: Black salt and nutritional yeast both bring significant sodium. Taste the sauce before adding any extra salt — most people find it needs none.
- Garnishing with fresh parsley: Skip the garnish — not worth the extra dish. The black pepper finish is enough, and the parsley gets lost against the richness of the sauce anyway.
Vegan Carbonara
Equipment
- 1 Blender
- 1 Large sauté pan
- 1 Medium pot
- 1 Wooden spoon or spatula
- 1 Colander
Ingredients
For the Cashew Carbonara Sauce
- 1 cup raw cashews Soaked in hot water for 20 minutes then drained
- 1 ¼ cups unsweetened almond milk or any neutral plant milk, preferably room temperature
- 3 tablespoons nutritional yeast Adds cheesy umami flavor
- 1 teaspoon black salt (kala namak) Provides eggy flavor; adjust to taste
- ½ teaspoon freshly ground black pepper
- 1 tablespoon lemon juice Freshly squeezed preferred
For the Pasta & Smoky Tempeh
- 12 oz spaghetti Use high-quality durum wheat or gluten-free if needed
- 1 tablespoon olive oil Extra virgin preferred
- 1 cup smoked tempeh or vegan bacon Chopped into small cubes
Optional Garnishes
- 2 tablespoons fresh parsley Finely chopped
- 1 teaspoon cracked black pepper For finishing
Instructions
- Make the Carbonara Sauce: Combine soaked cashews, unsweetened almond milk, nutritional yeast, black salt, black pepper, and lemon juice in a high-speed blender. Blend on high until silky smooth—this should take about 1–2 minutes. The sauce should be creamy and pourable. Taste and adjust for salt or lemon juice if desired.
- Cook the Pasta: Bring a medium pot of salted water to a boil. Add spaghetti and cook according to package instructions until al dente (typically 8–10 minutes). Drain and reserve about 1/2 cup of pasta water.
- Sauté the Tempeh: While the pasta cooks, heat olive oil in a large sauté pan over medium heat (around 350°F / 175°C). Add the diced smoky tempeh and cook for 5–7 minutes, stirring occasionally, until golden brown and slightly crispy on the edges.
- Combine & Finish: Lower the heat on the sauté pan to medium-low. Add the drained spaghetti to the pan with the tempeh and pour in the cashew carbonara sauce. Toss to coat everything evenly. Add reserved pasta water slowly if the sauce needs thinning—it should coat the noodles luxuriously without becoming soupy. Heat gently for ~2 minutes to marry the flavors.
- Garnish and Serve: Divide the pasta into warm bowls. Garnish with fresh parsley and a generous crack of black pepper. Serve immediately while warm and creamy.
Notes
- Don’t skip the black salt (kala namak)—it's key to mimicking the eggy flavor of classic carbonara.
- For a nut-free version, substitute sunflower seeds for cashews, but soak for an extra 10 minutes.
- To enhance umami, a small splash of soy sauce or a pinch of white miso can be added to the sauce before blending.
Nutrition
Common questions
Can I use a different pasta shape?
Yes — spaghetti is traditional here but rigatoni or bucatini both work well. Avoid very thin pasta like angel hair; it tends to clump in a thick cashew sauce before you can get it evenly coated.
I don’t have time to soak cashews overnight. Is there a faster option?
Boil the cashews in water for 15–20 minutes instead. The texture won’t be quite as silky as an overnight soak, but it’s close enough for a weeknight. Drain and rinse them before blending.
Will this taste strongly of cashews?
No — once blended with nutritional yeast, black salt, and pasta water, the cashew flavor essentially disappears into the sauce. Most people can’t identify the base ingredient without being told.
Can I make the sauce ahead of time?
Yes, up to two days in advance. Store it in a sealed jar in the fridge and give it a good stir before using — it will thicken as it sits, so thin it with a little water or plant milk when you’re ready to cook.