Papas Gratinadas Picantes

Steps

1. 1

   Roast poblano peppers

   • Place the 4 whole poblano peppers directly on the broiler rack (or on a foil-lined tray 4 inches from the broiler element).
   • Broil for 10–12 minutes, turning with tongs every 2–3 minutes, until the skin is charred and blackened all over (it's okay if the peppers look very dark).
   • Carefully transfer them to a plastic bag or bowl covered with plastic wrap and let them steam and cool for 3 minutes.
   • Once cool enough to handle, rub off the blackened skin with your fingers under cool running water, carefully remove and discard the stem and seeds, and slice the peppers into ½-inch-wide strips.
   • Set aside.

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   Ready when: Skin is blackened and blistered on all sides

   Tip: Don't peel the peppers under a broiler—it dries them out. Water and steam do the work for you.

2. 2

   Sauté onion, garlic, and peppers

   • Heat a large skillet over medium heat and melt the 2 tbsp (30 g) butter.
   • Add the sliced onion and cook, stirring occasionally, for 4 minutes until softened and just beginning to turn golden at the edges.
   • Add the minced garlic and cook for 1 minute until fragrant.
   • Stir in the roasted poblano strips and the minced jalapeño (if using).
   • Cook for another 2 minutes, stirring gently, to warm through and combine the flavors.
   • Season lightly with salt and pepper.
   • Transfer to a bowl and set aside.

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   Ready when: Onions are soft and translucent; garlic is fragrant and no longer raw

   Tip: Don't rush this step—a few minutes of cooking mellows the onion and helps the flavors meld together.

3. 3

   Mix the cream sauce

   • In a large bowl, whisk together the heavy cream, broth, ground cumin, remaining salt, and black pepper until the cumin is fully dissolved.
   • Taste and adjust seasoning—the sauce should be well-seasoned but not overly salty (remember you'll be adding salty queso fresco).
   • Set aside.

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   Tip: Whisk thoroughly so the cumin fully incorporates—you don't want bitter gritty bits in the finished dish.

4. 4

   Assemble the gratin

   • Butter the inside of a 9×13-inch baking dish generously.
   • Spread about ⅙ of the sliced potatoes in an even layer on the bottom.
   • Sprinkle with about ⅓ of the sautéed onion-pepper mixture, then about ⅓ of the crumbled queso fresco.
   • Pour about ⅓ of the cream sauce over the top.
   • Repeat this layering two more times: potatoes, onion-pepper mixture, cheese, and sauce.
   • Finish with the remaining potatoes arranged in a neat layer, then pour any remaining cream sauce evenly over the top.
   • Sprinkle the last of the crumbled cheese over the surface.
   • (The dish can be covered and refrigerated for up to 4 hours before baking; add 10 minutes to the baking time if baking from cold.)

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   Ready when: All ingredients are layered with sauce visible between layers

   Tip: Use an offset spatula or the back of a spoon to spread the sauce evenly; this ensures even cooking and creamy potatoes throughout.

5. 5

   Bake the gratinOven 375°F / 190°C

   • Place the baking dish in the preheated 375°F (190°C) oven.
   • Bake for 50–55 minutes, until the top is light golden brown and the potatoes are very tender when pierced with a knife.
   • The cream should be gently bubbling around the edges of the dish.
   • If the top isn't browning enough after 40 minutes, you can increase the heat to 400°F (205°C) for the last 10–15 minutes.

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   Ready when: Potatoes are very tender when pierced with a knife; top is golden brown and edges bubble gently

   Tip: If the top browns too quickly, loosely tent the dish with foil for the last 15 minutes to prevent burning.

6. 6

   Rest and serve

   • Remove the gratin from the oven and let it rest at room temperature for 5 minutes.
   • This allows the cream sauce to set slightly so the gratin holds together better when serving.
   • Scatter the fresh cilantro over the top if desired.
   • Serve directly from the baking dish, or use a sturdy spatula to scoop generous portions onto plates.

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   Ready when: Surface is set but still warm; cilantro is scattered on top

   Tip: Resist the urge to cut into it right away—the extra 5 minutes makes a big difference in how cleanly each portion comes out.