If you have fear of cooking fish, well, so do I. It goes from just right to overcooked so fast! And a piece of overcooked fish is a sorrow, small but real. So, good news: Fish cooked in parchment paper is as dummy-proof as it gets. The two variations here – one with potatoes, along the lines of Le Caviste, and one with asparagus, along the lines of thank-God-for-spring – have cooking times that vary by five entire minutes. (Potatoes, even parboiled ones, take longer to cook than asparagus.) In the non-en-papillote world, cooking fish for five more minutes can be ruinous. Don’t even worry about it! That fish is crimped snugly into its packet, all steamy-nice with butter and wine and lemon, plus herby-garlicky parsley sauce. The steaminess can’t get out, so there’s no danger of the fish drying out.

If you encounter trouble with folding and crimping closed the papers’ edges, just use a paper clip at any questionable spots. (The pros at Le Caviste don’t ever need to do this, but I’ve done it at home.) Then, you and your friend each get your own wrapped-up present of a supper. Serve with some baguette for sopping up the extra lemony-winey-buttery sauce. And when life gives you lemon slices this good, you should eat them.

FISH EN PAPILLOTE WITH POTATOES OR ASPARAGUS AND PARSLEY SAUCE

Any kind of white fish works. If you’re making it with potatoes, Yukon Gold are good, but really, any kind is fine. And note that if you are using potatoes, that requires a little ahead-of-time prep: A couple hours (or a day or two) ahead of time, parboil one medium potato: Wash it thoroughly, and bring enough water to amply cover it to a boil. Add potato carefully, reduce heat to medium-high and cook for 15 minutes. Rinse with cold water, and put uncovered in a bowl in the fridge to cool before slicing.

Serves 2

FOR THE VEGETABLES:

1 medium parboiled potato, sliced into very thin rounds (a mandoline helps a lot)

or …

1 bunch (about 12 stalks) asparagus, rinsed and butt-ends snapped off

FOR THE FISH:

Parchment paper

2 pats of butter

Kosher salt and freshly ground pepper

2 fish fillets, 4 to 6 ounces each, of rockfish, cod, flounder or any white fish

4 thin slices of lemon

2 tablespoons white wine

FOR THE PARSLEY SAUCE:

1 clove garlic

1/2 bunch parsley (about a cup loosely packed, not including larger stems)

1/2 teaspoon kosher salt

About 1/4 cup extra-virgin olive oil

1. Preheat oven to 375 degrees.

2. Make the parsley sauce: Mince garlic and chop parsley finely, and add to small bowl. Add salt, and stir to combine. Drizzle in olive oil slowly while stirring thoroughly with a fork. (You also could use a food processor or immersion blender.)

3. Assemble your packets: Tear off two large squares of parchment paper, and crease them on the diagonal. On one diagonal half of each square, near the crease, arrange a slightly-larger-than-fish-fillet-shaped layer of potatoes barely overlapping, or a slightly-larger-than-fish-fillet-shaped raft of asparagus. Put one pat of butter atop the potatoes or asparagus, and sprinkle with salt and pepper. Put the fish fillets atop the potato or asparagus layer; sprinkle with salt and pepper, then top each fillet with two slices of lemon and half the parsley sauce. Pour one tablespoon of wine over each fillet.

4. For each packet, fold the parchment paper over diagonally, then fold and crimp the open sides tightly around the fish and vegetable arrangement to create a half-moon-ish shape. You want to create a good seal; if any spots seem like they might let the steam out, use (uncoated!) paper clips to secure them.

5. Bake 20 minutes for potatoes, 15 minutes for asparagus.

6. Slide each packet onto a large plate, then slit the top with a sharp knife and serve immediately.