Cacio e Pepe with Ramps

Cacio e Pepe is a very simple Roman dish, but it's a bitch to get right. It's just pasta, water, pecorino romano cheese, and black pepper: no oil, no cream, no egg, nothing else. But the cheese wants to glop up or stick to the pot/skillet. This is our second take and we're adding ramps  which we get at the farmers market during their short season.

Not the best lighting for the finished dish :-(

One of the better discussions I've seen on cacio e pepe is on Serious Eats; he blooms the pepper in oil to bring out flavor and uses a bit of butter. Since I have to sauté the ramps anyway, I'll do both in butter; we'll try and stay pure by not adding oil. We also use Serious Eats technique of low-water boiling to increase starch; you really don't need a giant pot of water!

I've tried this before with homemade pasta and it was too soft to withstand the physical beating necessary to emulsify the cheese, so use commercial dry pasta.

225 g Spaghetti pasta (1/2 pound, 1/2 box)
80 g Pecorino Romano cheese (3 ounces)
lots of Black Pepper, freshly ground
Ramps
Butter, unsalted

Ramps are in season at the farmers market

Boil the pasta in as little water as needed to cover, with a bit of salt, stirring to ensure the strands don't stick. Cook until a couple minutes away from done, very al dente.

Grate the Pecorino very fine on a microplane or rotary grater.
Grind the pepper coarsely.
Slice the ramp stems into smallish pieces that'll fit on a fork, and the leaves into larger slices that will wilt down a bit; keep them separate.

Mise en place is essential, this comes together quickly

Heat the butter in a nonstick skillet.
Add Ramp stems and pepper, cook until fragrant.
Add Ramp leaves and cook to wilt a bit.
Remove from pan and reserve in a bowl to add later.

Turn off the heat on the skillet so the surface can cool down, to prevent cheese sticking.
When pasta is about 2 minutes from done,
ladle some of the now starch-rich water into the skillet.
Add most of the grated Pecorino and stir into the water.
Use tongs to transfer the Spaghetti to the skillet and stir into the water/cheese;
it's fine if you have water dripping from the pasta.
Stir vigorously to turn the water, starch and cheese into an emulsion coating the pasta;
add more pasta water if it's too thick, and test the pasta for doneness.
Add the Ramps and a bunch more ground Pepper, combine.

Serve and top with the rest of the grated Pecorino.

Confession: my cheese glopped together as I stirred, and I stirred quite vigorously, shaking the pan with one hand and stirring with tongs in the other. The crappy quality of the photo and the garnish of pecorino hides the glops. I had turned the heat back on low, figuring I needed enough heat to melt, but that may have been a mistake.

The TalesOfAmbrosia blog has a very simple recipe that heats the serving bowl over the pasta pot, but then combines everything off heat in that bowl.  I really do think heat is the issue.

On Republica's Scienza in Cucina blog, the article Le ricette scientifiche: la cacio e pepe is very helpful; use Google Translate :-)

Lucky Peach has 3 recipes in the print edition, but this one online is quite explicit about excessive heat causing lumps; interestingly, he makes fresh pasta.

After some experimentation, keeping temperature low solves the glopping problem.
Before adding the cheese, keep the water between 55-65C (130-150F) so the cheese won't coagulate due to excessive heat; maintain this range as you add the other ingredients. You'll probably need to let the starchy pasta water cool a bit as it will be coming off the boil.