Pambazos (Salsa-Dipped Potato and Chorizo Sandwiches)

Ingredients :

1. 15 dried guajillo chiles 
2. 1 clove garlic
3. ¹⁄₂ small white onion, roughly chopped
4. 2 ¹⁄₄ lb. Yukon gold potatoes, peeled and cut into ¹⁄₂" cubes
5. Kosher salt, to taste
6. ¹⁄₂ cup canola oil
7. 1 ¹⁄₄ lb. fresh chorizo, casings removed
8. 6 soft pambazos, teleras, or kaiser rolls, split
9. 3 shredded iceberg lettuce
10. 2 cups grated queso Oaxaca or mozzarella
11. ³⁄₄ cup crema or sour cream

Directions

1. Heat a 12" skillet over medium-high heat. Working in batches, add chiles, and cook, turning once, until toasted, about 2 minutes. Transfer all chiles to a large bowl; pour over 4 cups boiling water, and let sit until chiles are soft, about 30 minutes. Drain, reserving 1 1⁄4 cups soaking liquid, and remove stems and seeds from chiles. Transfer chiles and reserved soaking liquid to a blender along with garlic and onion; purée until very smooth, at least 2 minutes. Pour sauce into a bowl; set aside.
2. Bring a 4-qt. saucepan of salted water to a boil over high heat; add potatoes, and cook until just tender, about 10 minutes. Drain and set aside. Heat 2 tbsp. oil in a 12" skillet over medium heat; add chorizo, and cook, stirring to break up into small pieces, until browned and cooked through, about 8 minutes. Add potatoes, and cook until potatoes are very tender, about 2 minutes; season with salt and pepper and set aside.
3. Using your fingers, scoop out and discard the insides of rolls, leaving a 1⁄2"-thick shell. Place about 1 cup potato-chorizo mixture on roll bottoms, and cover with tops; press sandwiches lightly to flatten and compact filling. Heat 2 tbsp. oil in a 12" skillet over medium-high heat. Submerge two sandwiches in chile sauce until thoroughly soaked, at least 10 seconds; place in skillet, and cook, pressing constantly with a metal spatula to flatten and flipping once, until browned on both sides, about 5 minutes. Transfer to a cutting board; repeat with remaining oil, sandwiches, and sauce. Open sandwiches and divide lettuce, cheese, and crema among sandwiches; close sandwiches again and serve warm.