I first tried this recipe over 20 years ago. My son loves it and frequently requests it, as he did when he called me last night, "Hi Mom, can I come over to dinner tomorrow? Can you please make the green spaghetti?"
It's not exactly figure friendly, and it doesn't keep, but it's very tasty and very filling. The recipe calls for one big clove of garlic. If you use two, the garlic is overpowering. The sauce is basically uncooked, so it's pretty potent. But we love it.
Spaghetti with Parsley Sauce
1 1/2 cups firmly packed parsley
1 large clove garlic
2 hard boiled egg yolks
2 scallions, coarsely chopped
1/4 cup chopped walnuts
3 Tablespoons unsalted butter
1/2 cup olive oil
1/2 cup Parmesan cheese, grated
1/4 cup chopped red pepper
1/2 pound cooked spaghetti
In a food processor, puree the parsley, garlic, egg yolks, scallion, walnuts, butter. With motor running, add oil in a thin stream.
Transfer to heated bowl. Stir in parmesan.
Toss with spaghetti, top with chopped red peppers.
from Gourmet Magazine