The secret to an exceptionally creamy white lasagna lies in building a rich béchamel-style sauce that truly coats every layer. This white lasagna recipe focuses on crafting a luxurious, cheesy sauce with Emmi Raclette, complemented by earthy mushrooms and fresh spinach. It’s a delightful twist on a classic, perfect for those seeking comfort food with an elegant touch. I remember the first time I attempted a white sauce; it broke on me because the heat was too high. I learned quickly that a gentle simmer and constant whisking are key to a smooth, lump-free béchamel. This recipe is designed to guide you to that perfect, velvety consistency every time, ensuring a truly satisfying dish.
Key takeaways
- A smooth béchamel is crucial; cook the roux properly and add liquids gradually.
- Sautéing mushrooms until browned concentrates their flavor.
- Incorporate pesto at the end to preserve its fresh taste.
- Ensure enough moisture for lasagna sheets to cook through.
Creamy White Pesto Lasagna
Ingredients
- 2 tablespoons extra virgin olive oil
- 6 tablespoons salted butter
- 12 ounces wild mushrooms, roughly torn
- kosher salt and pepper
- 2 cloves garlic, minced or grated
- 1 tsp dried oregano
- 1/4 cup all-purpose flour
- 2 cups whole milk
- 2 cups vegetable broth
- 2 cups shredded Emmi Raclette (provolone or fontina can be used)
- 12-16 lasagna sheets
- 1 cup grated Parmesan cheese, divided
- 15 ounces ricotta cheese
- 10 ounces fresh spinach
- 1/2 cup prepared pesto
Instructions
- Preheat the oven to 350 degrees F. Grease a 9×13 inch pan.
- Heat the olive oil in a large skillet over medium heat. Add the mushrooms and season with salt and pepper. Cook undisturbed for 5 minutes or until golden, then stir and continue cooking until caramelized, 3-5 minutes. Remove the mushrooms to a plate.
- Add the butter, garlic, oregano, salt, and pepper to the skillet and cook for 30 seconds until fragrant. Whisk in the flour and cook for about 1 minute. Add the milk and broth. Bring to a boil and stir for 1 minute. Remove from heat and stir in the Raclette cheese and 1/2 cup of parmesan cheese until melted and smooth.
- In a medium bowl, combine the ricotta, spinach, and pesto.
- Spread 1/4 of the cheese sauce in the bottom of the prepared baking dish. Top with 3-4 lasagna sheets. Spread with 1/2 of the ricotta cheese mixture, another 1/4 of the cheese sauce, and half of the mushrooms.
- Place another 3-4 lasagna noodles on top, then top with the remaining ricotta cheese mixture, another 1/4 of the cheese sauce, and the remaining mushrooms. Add the remaining lasagna noodles and pour the remaining cheese sauce over top. Top with the remaining 1/2 cup of parmesan cheese.
- Bake uncovered for 45 minutes or until the top has bubbled and browned. Let stand 10 minutes before serving.
Notes
– Whisk the flour into the butter for at least a minute to cook out the raw flour taste before adding liquids.
– Ensure your milk and broth are at room temperature or slightly warm to prevent lumps when adding to the roux.
– For food safety, make sure the internal temperature of the lasagna reaches 165°F (74°C) when fully cooked. Nutrition information is an estimate, calculated automatically. Values vary with brands, substitutions and portion sizes.
The Technique That Makes It: Building a Rich, Stable White Sauce
The foundation of this creamy white pesto lasagna is a well-made béchamel sauce, elevated with cheese and pesto. The key to a lump-free, velvety sauce lies in the roux and the gradual addition of liquids. First, melt the butter and sauté the mushrooms until they release their moisture and begin to brown. This Maillard reaction concentrates their flavor. Then, add the garlic and oregano, cooking briefly until fragrant. Whisking in the flour to create a roux and cooking it for a minute or two is crucial. This cooks out the raw flour taste and helps thicken the sauce effectively. Gradually whisking in the cold milk and then the warm vegetable broth, a little at a time, prevents lumps from forming. Bring the mixture to a simmer, stirring constantly, until it thickens to a consistency that coats the back of a spoon. This controlled heating and constant agitation are essential for a smooth emulsion. Finally, melting in the Raclette cheese off the heat ensures a creamy, cohesive sauce without breaking. The final stir-in of pesto adds a vibrant flavor layer just before assembly.
Troubleshooting
- Problem: Lumpy Béchamel Sauce. Fix: If lumps form, you can try to whisk them out vigorously. For stubborn lumps, carefully strain the sauce through a fine-mesh sieve. Ensure future sauces are made by gradually adding liquids to the roux while whisking constantly.
- Problem: Sauce is too thin. Fix: Simmer the sauce uncovered for a few more minutes, stirring occasionally, to allow excess liquid to evaporate and thicken the sauce. Alternatively, create a slurry of 1 tablespoon cornstarch mixed with 2 tablespoons cold water and whisk it into the simmering sauce until thickened.
- Problem: Lasagna noodles are hard or undercooked. Fix: Ensure your lasagna sheets are fully submerged in the sauce and moisture during baking. If using no-boil noodles, they require ample liquid to hydrate properly. If using regular noodles, make sure they are cooked al dente before layering, as they will continue to cook in the oven.
- Problem: Pesto flavor is lost. Fix: Stir the pesto into the sauce just before assembling the lasagna, rather than cooking it for an extended period. This preserves its fresh, herbaceous notes. You can also add a little extra pesto on top before baking for a more pronounced flavor.
Substitutions
- Mushrooms: While wild mushrooms offer depth, cremini or shiitake mushrooms can be used. The flavor will be less complex but still delicious.
- Emmi Raclette: Provolone or Fontina cheese can be substituted for Raclette. They will provide a similar meltiness and mild, nutty flavor profile.
- Whole Milk: 2% milk can be used, but the sauce may be slightly less rich. Avoid skim milk, as it can result in a thinner sauce.
- Vegetable Broth: Chicken broth can be substituted for vegetable broth for a slightly richer, non-vegetarian sauce.
Pro tips
- Don’t overcrowd the skillet when cooking mushrooms; this ensures they brown beautifully instead of steaming.
- Whisk the flour into the butter for at least a minute to cook out the raw flour taste before adding liquids.
- Ensure your milk and broth are at room temperature or slightly warm to prevent lumps when adding to the roux.
- For food safety, make sure the internal temperature of the lasagna reaches 165°F (74°C) when fully cooked.
This White Pesto Spinach Lasagna offers a comforting yet sophisticated meal, perfect for gatherings or a special weeknight dinner. Experiment with different cheeses or add roasted vegetables for your unique spin. Enjoy!
Frequently asked questions
Can I use regular lasagna noodles instead of no-boil?
Yes, you can use regular lasagna noodles. Cook them according to package directions until al dente before layering. They will finish cooking in the oven, absorbing the sauce and ensuring a tender texture in the final dish.
What kind of mushrooms are best for this lasagna?
Wild mushrooms, like shiitake or cremini, are recommended for their robust flavor. However, a mix of your favorite mushrooms will work well. Ensure they are well-browned to develop their savory taste.
How can I make the white sauce smoother if it has lumps?
If your sauce develops lumps, try whisking vigorously. For persistent lumps, carefully strain the sauce through a fine-mesh sieve. Always add liquids gradually to the roux while whisking constantly to prevent lumps from forming.
Can I add other vegetables to the lasagna?
Absolutely. You can add sautéed spinach, caramelized onions, or roasted red peppers to the layers. Ensure any added vegetables are cooked and excess moisture is removed before assembling to avoid a watery lasagna.
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