Creamy Greens, Potatoes and Caramelized Onions for Tacos (Quelites, Papas y Cebollas Caramelizadas para Tacos)

• 2 large poblano chiles
• 3 tbsp olive oil, fresh pork lard, bacon drippings or butter
• 1 large (8-ounce) white onion, sliced ¼-inch thick (about 2 cups)
• Salt
• 12 ounces (3 medium) boiling potatoes like the red-skin ones, peeled or not, cut into cubes a little smaller than ½ inch
• 1 pound kale (I prefer black/Lacinato), lamb’s-quarters greens (quelites de ceniza) or amaranth greens (quintoniles), stems removed, cut crosswise into ½-inch strips (you’ll need about 4 ½ gently packed cups of sliced leaves)
• 1 cup Mexican crema, crème fraiche or heavy cream OR 1 cup sour cream or Greek-style yogurt
• About 4 ounces (1 cup) crumbled Mexican queso fresco or other fresh cheese like goat cheese, salted farmers cheese or mild feta
• 12 to 16 warm corn tortillas, for serving
• About 1 cup Herby, Spicy Tomatillo Salsa (or another of your favorite salsas)

Roast and peel the poblanos

1. 1

   Roast the poblanos over an open flame or up close under a hot broiler until they are evenly charred all over. Cool until handleable, then rub off the blackened skin, tear open and pull out the seed pod and the attached stem. Quickly rinse the chile flesh to remove any stray seeds or bits of skin and slice into ¼-inch strips. If the strips are long, cut them in half.

Caramelize the onion

1. 2

   Heat whichever oil or fat you’ve chosen in a very large (12-inch skillet) over medium. Add the onion and cook, stirring regularly, until richly browned, about 8 minutes.

Cook the potatoes and greens

1. 3

   Meanwhile, fill a large (4-quart) saucepan about 2/3 full with water, heavily salt it and bring it to a boil over medium-high heat. Add the potatoes and cook just until completely tender, about 8 minutes. Use a spider/skimmer or slotted spoon to transfer the potatoes to the caramelized onions. Return the saucepan to the medium-high heat and add the greens. Cook until tender, anywhere from 2 to 5 minutes, depending on your greens and how done you like them. Use a spider/skimmer or slotted spoon to transfer the greens to the skillet. Add the chile strips.

Finish the dish

1. 4

   Add the crema (or crème fraiche or whipping cream)—but not the sour cream or yogurt—and cook over medium-high heat for a few minutes, for the flavors to come together and the crema to thicken enough to coat everything. If using the sour cream or yogurt, heat everything in the skillet, stirring until all the vegetables are steaming. Remove from the heat, let stand a minute, then stir in the sour cream or yogurt. Taste and season with salt, usually 1/2 teaspoon (if you heavily salted the potato/kale water).

Serve

1. 5

   Scoop the mixture into a serving dish, sprinkle with the cheese and serve with the warm tortillas and salsa.