4 ounces white cheddar or manchego cheese, shredded (about 1 cup)
Griddle-roast chiles until black all over, peel and seed. Puree in a blender
or food processor with the cilantro, onion and garlic. Bring a large pot of water
to a boil and add 5 teaspoons of the salt. Add the spaghetti and cook according
to the package directions; it should not be al dente.
While the spaghetti cooks, heat the butter in a medium saucepan over medium heat.
When it foams, add the chili mixture. Cook, partly covered, for 10-12 minutes. Stir
in the crema or cream and the remaining 1 teaspoon salt.
Drain the spaghetti when almost done to your taste. Return to the pot, pour the
sauce over it and toss to combine well. Scatter the cheese over the spaghetti and
serve at once.