Wash basil and pat with paper towels. Process ingredients for processor until you have a creamy consistency. Add in the rest of the ingredients by hand, first adding in all cheese until it is really smooth. Then add butter in at the end.
/2 pounds pasta (I used one pound in spaghetti and 1 1/2 with fusilli)
small new potatoes, boiled in skin, skin removed afterward, thinly sliced
/2 pound young green beans, ends snapped, cut half (depending on size)
Save a few Tablespoons of pasta water to add into pesto
Toss pesto with cooked pasta, beans, and potatoes. Add in pasta water as needed. Serve immediately. Season with salt and pepper to taste.