July 23, 2026 · 5 min

Spicy-Sweet Portobello Lo Mein with Bell Pepper and Peanuts

Lunch5 min1334 cal / serving

Craving bold, satisfying noodles without the wait? This spicy-sweet portobello lo mein brings the heat and the flavor straight to your kitchen in under 30 minutes. Tender lo mein noodles are tossed with meaty portobello mushrooms, crisp bell pepper and onion in a luscious sauce made with honey, miso and Szechuan paste.

A final sprinkle of crunchy peanuts adds the perfect finishing touch. It’s a wholesome, veggie-packed meal that’s quick enough for a busy weeknight but impressive enough to serve guests. Ditch the takeout menu and give this easy stir-fry a try!

Recipe details

Lunch5 min1334 cal / serving2 servings

Nutrition per serving

Calories1334 kcalProtein11.4 gFat114.8 gCarbs68.6 gSugar26 gFiber5.4 gSodium1049 mg

Dietary labels

Gluten-free: noLactose-free: yesDairy-free: yes

Allergen check

Gluten / wheat: containsMilk / dairy: not detectedEgg: not detectedFish: not detectedShellfish: not detectedPeanut: containsTree nuts: not detectedSoy: containsSesame: containsMustard: not detectedCelery: not detectedSulphites: not detectedLupin: not detectedMolluscs: not detected

Values are calculated per serving from ingredient amounts and the ingredient nutrition reference per 100g. Allergen and diet labels use available ingredient metadata and name matching; always check product labels for strict diets or allergies. Some ingredient amounts or nutrition values were incomplete, so this is marked as a partial estimate.

Ingredients

Green Bell Pepper1 unit Green Bell PepperView ingredient guide
Lo Mein Noodles4.5 ounce Lo Mein NoodlesView ingredient guide
Onion1 unit OnionView ingredient guide
Soy Sauce1 tablespoon Soy SauceView ingredient guide
Szechuan Paste1 tablespoon Szechuan PasteView ingredient guide
Honey4 teaspoon HoneyView ingredient guide
Portobello Mushrooms2 unit Portobello MushroomsView ingredient guide
Peanuts1 ounce PeanutsView ingredient guide
Black Pepperteaspoon (tsp) Black PepperView ingredient guide
Saltteaspoon (tsp) SaltView ingredient guide
Cooking Oil2 teaspoon (tsp) Cooking OilView ingredient guide

Instructions

  1. Bring a medium pot of salted water to a boil. Meanwhile, wash and dry all produce. Halve, peel and thinly slice the onion. Halve, core and thinly slice the bell pepper into strips. Use the tip of a spoon to scrape out and discard the black gills from the undersides of the portobello mushrooms; trim any large stems if needed. Thinly slice the mushrooms into strips (if strips are too long, cut them in half crosswise).
  2. In a small bowl, whisk together the honey, miso sauce concentrate, half the soy sauce, half the rice wine vinegar, half the Szechuan paste (use more for extra heat) and ¼ cup water. (For 4 servings, use all the soy sauce, all the vinegar and ⅓ cup water.)
  3. Heat a large drizzle of oil in a large pan over medium-high heat. Add the onion, bell pepper and mushrooms; cook, stirring occasionally, until softened and lightly browned, 5-7 minutes. Stir in the Szechuan sauce mixture; cook, stirring occasionally, until the sauce has reduced and slightly thickened, 1-2 minutes.
  4. Once the water is boiling, add the lo mein noodles to the pot. Cook, stirring occasionally, until al dente, 5-7 minutes. Drain the noodles.
  5. While the noodles cook, roughly chop the peanuts. Add the drained noodles to the pan with the vegetables; toss until the noodles are thoroughly coated in the sauce. Taste and season with salt and pepper if desired.
  6. Divide the lo mein between shallow bowls. Top with the chopped peanuts and serve immediately.

Recipe Tips

For a milder dish, use less Szechuan paste; for more heat, add the full amount or a pinch of red pepper flakes.

Make sure to scrape the gills from the portobello mushrooms to avoid a muddy color in the sauce.

If you prefer extra crunch, toast the peanuts in a dry pan for 1-2 minutes before chopping.

FAQ

Can I use a different type of noodle?

Yes, you can substitute lo mein noodles with udon, soba or even spaghetti. Adjust cooking time according to package directions.

Is this recipe gluten-free?

Not as written, because lo mein noodles and soy sauce contain wheat. To make it gluten-free, use gluten-free noodles and tamari or coconut aminos instead of soy sauce.

Can I make this dish ahead of time?

Lo mein is best enjoyed fresh, but leftovers can be stored in an airtight container in the fridge for up to 2 days. Reheat in a pan with a splash of water to loosen the sauce.

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