Vietnamese Lemongrass Beef Lasagna with Fresh Herbs

Steps

1. 1

   Cook the lasagna noodles

   • Bring a large pot of salted water to a boil.
   • Add the lasagna noodles and cook according to package directions until just tender but still slightly firm to the bite (about 9–10 minutes).
   • Drain well and toss lightly with a small amount of oil to prevent sticking.
   • Lay them flat on a clean kitchen towel to cool.

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   Ready when: Noodles are tender but not soft or falling apart

   Tip: Don't overcook the noodles; they will soften more in the oven. Al dente is key for a lasagna that holds together.

2. 2

   Prepare the beef mixture

   • Heat the vegetable oil in a large saucepan or skillet over medium-high heat.
   • Add the minced shallots and the white parts of the scallions, and cook for 2 minutes until softened and fragrant.
   • Add the minced garlic and sliced lemongrass, and cook for another 1–2 minutes, stirring, until the lemongrass releases its aroma.
   • Crumble in the ground beef and cook, breaking it apart with a wooden spoon, for 8–10 minutes until cooked through and no pink remains.
   • Drain off excess fat if needed.

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   Ready when: Beef is fully cooked with no pink; lemongrass and shallots are soft and fragrant

   Tip: Don't stir too frequently; let the beef brown slightly for better depth of flavor, then break it apart.

3. 3

   Season the beef

   • To the cooked beef, add the fish sauce, soy sauce, ground cinnamon, black pepper, and sugar.
   • Stir well to combine and cook for another 1–2 minutes.
   • Taste and adjust seasoning if needed.
   • The mixture should smell deeply savory and aromatic.
   • Remove from heat and fold in most of the cilantro and mint, reserving some for layering.
   • Keep the mixture warm.

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   Ready when: Seasonings are fully incorporated and aroma is balanced and fragrant

   Tip: Add seasonings while the pan is still warm so they distribute evenly. If the beef smells too fishy, add a tiny pinch more sugar to balance.

4. 4

   Make the béchamel sauce

   • In a medium saucepan, melt the butter over medium heat.
   • Whisk in the flour to create a paste (roux) and cook for 1–2 minutes, stirring constantly, until it turns a pale golden color.
   • Do not brown.
   • Slowly add the warmed milk while whisking constantly to prevent lumps.
   • Continue cooking and stirring for 5–7 minutes until the sauce thickens enough to coat the back of a spoon.
   • Season with salt, white pepper, and nutmeg.
   • The sauce should be smooth and creamy.

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   Ready when: Sauce coats the back of a spoon and is silky smooth with no lumps or grittiness

   Tip: Warm the milk before adding so the roux doesn't seize. Whisk constantly to avoid lumps. If lumps do form, strain through a fine sieve.

5. 5

   Assemble the lasagna

   • Spread a thin layer of béchamel (about ½ cup) on the bottom of a 9×13-inch baking dish.
   • Lay a single layer of cooked noodles (about 4–5 noodles, overlapping slightly).
   • Spread half of the beef mixture over the noodles, then scatter with half of the remaining cilantro and mint.
   • Drizzle ⅓ of the remaining béchamel over the herbs.
   • Layer noodles again, then the remaining beef mixture, the remaining herbs, and another ⅓ of the béchamel.
   • Top with the final layer of noodles and finish with the last ⅓ of the béchamel, spreading it evenly to seal in the layers and prevent drying.

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   Ready when: All noodles are fully submerged or covered; no dry edges visible

   Tip: Make sure each layer is well-distributed so no pockets form. The béchamel on top should reach the edges to prevent browning and drying of the noodles.

6. 6

   Bake the lasagnaOven 375°F / 190°C

   • Cover the baking dish loosely with aluminum foil and place in a preheated 375°F (190°C) oven.
   • Bake for 35 minutes covered.
   • Remove the foil and bake for an additional 12–15 minutes until the top is golden brown and the sauce bubbles around the edges.
   • The internal temperature should reach 165°F (74°C) when checked with an instant-read thermometer in the center.

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   Ready when: Top is golden brown; sauce bubbles at the edges; internal temperature reaches 165°F (74°C)

   Tip: Cover with foil first to keep the top from browning too quickly while the layers heat through. Don't skip the final uncovered time—it ensures the top browns and the flavors meld.

7. 7

   Rest and garnish

   • Remove the lasagna from the oven and let it rest for 10–15 minutes at room temperature before cutting.
   • This allows the layers to set slightly and makes serving cleaner.
   • Garnish the top with the reserved light green scallion tops for a fresh color and mild onion flavor.

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   Ready when: Lasagna is still hot and holds shape when a serving spoon cuts through it

   Tip: Resting is crucial. If you slice too soon, the layers will slide apart and look messy. A rested lasagna will have clean, defined layers.