Wild Mushroom + Spinach Lasagna
Three mushrooms, sautéed spinach, real béchamel, no-boil pasta. Sunday-dinner lasagna, vegetarian.
- Total time
- 110 min
- Hands-on
- 60 min
- Servings
- 8
- Difficulty
- medium
Lasagna divides into two camps: the meat-sauce-and-mozzarella camp, and the béchamel-and-Parmesan camp. This recipe is firmly in the second. The white sauce coats every layer in silken richness; the mushrooms supply the meaty depth ground beef would normally bring; spinach adds color and a vegetable counterpoint to the mushroom heaviness. The critical move with any vegetarian lasagna is moisture management. Mushrooms release water; spinach releases water; ricotta releases water if you don't drain it. Each of these has to be managed before the layers go together, or you end up with a soupy lasagna that won't hold a slice. The recipe builds in three water-removing steps (hot-sear the mushrooms past their water-release phase, squeeze the cooked spinach in a clean kitchen towel, drain the ricotta in a fine mesh for 20 minutes). No-boil noodles work fine for this style of lasagna because the béchamel provides enough liquid to hydrate them during the bake. Traditional boil-then-layer is also fine if that's your habit; reduce the béchamel volume by ~20% if going traditional.
Method
- 1
Heat oven to 375°F. Stage prep stations: one for mushrooms, one for spinach, one for béchamel, one for assembly.
- 2
Drain the ricotta: place it in a fine-mesh strainer over a bowl; let drain 20 minutes while you prep other components. Whisk the drained ricotta with the egg and 1/2 cup of the Parmigiano + a pinch of salt + several cracks of black pepper. Set aside.
- 3
Sear each mushroom variety SEPARATELY. Heat 1 tsp olive oil + 1 tsp butter in a large heavy skillet over medium-high. Add the cremini in a single layer; sear 3-4 min undisturbed until golden; toss; cook 2-3 more min. Transfer to a bowl. Repeat with shiitake. Repeat with oyster. After all three are seared, return the entire mushroom mix to the skillet; add the minced garlic + thyme; cook 60 seconds until fragrant; deglaze with a splash of water if browning sticks. Off heat. Salt + pepper to taste.
- 4
Cook the spinach. In a separate pan, heat 1 tsp olive oil over medium. Add the spinach in batches, stirring until each batch wilts; transfer to a colander as it wilts. When all spinach is wilted, transfer it to a clean kitchen towel; gather and twist firmly to wring out as much water as possible. Roughly chop the squeezed spinach. Combine with the mushroom mixture in a large bowl.
- 5
Make the béchamel. Melt 5 tbsp butter in a heavy saucepan over medium heat. Whisk in the flour; cook 60-90 seconds while whisking — don't let the roux color past pale gold. Slowly add the warmed milk in a thin stream, whisking constantly. Bring to a simmer; cook 5-7 minutes until thickened to a glossy, gravy-like consistency. Off heat. Stir in the nutmeg + 1/2 tsp salt + several cracks of black pepper.
- 6
Layer the lasagna in a 9x13 inch baking dish. Start with about 1 cup of béchamel spread on the bottom. Top with a layer of no-boil noodles. Spread half the ricotta mixture over the noodles. Top with about 1/3 of the mushroom-spinach mixture, then 1/3 of the remaining béchamel, then 1/3 of the mozzarella.
- 7
Repeat: noodles → remaining ricotta → 1/3 mushroom-spinach → 1/3 béchamel → 1/3 mozzarella.
- 8
Final layer: noodles → remaining mushroom-spinach → remaining béchamel → remaining mozzarella + remaining 1/2 cup Parmigiano + 1/2 cup Pecorino on top.
- 9
Cover the dish loosely with foil (tent slightly so foil doesn't touch the cheese). Bake 35 minutes. Remove foil; bake 15-20 more minutes until top is deeply golden and the lasagna is bubbling at the edges.
- 10
REST 20 MINUTES before slicing. Cutting hot lasagna produces a runny puddle; resting lets the layers set. Top with torn fresh basil. Serve.
Notes + variations
- •The 20-minute rest is non-negotiable. Lasagna out of the oven is too liquid to slice cleanly; resting tightens the structure.
- •Drain the ricotta. This single step prevents the most common lasagna failure (watery layers).
- •Sear the mushrooms in three separate batches. Trying to do all three at once produces stewed mushrooms, not seared mushrooms. The textural difference matters.
- •Make-ahead: assembled, unbaked lasagna keeps in the fridge 24 hours. Add 10 minutes to the bake time if going from cold.
- •Leftovers reheat better at 325°F covered with foil for 25 min than in a microwave. Freezes well — wrap individual portions; reheat from frozen at 350°F for 35-40 min covered.
Grow it yourself
This recipe pairs with the following cultivated strains. If you're growing at home, here's what to plant.
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