2 c. basil leaves
1/3 to 1/2 c. olive oil
2 tbsp. walnuts or pine nuts
2 cloves garlic, lightly crushed
1 tsp. salt
1/2 c. grated Parmesan cheese
2 tbsp. grated Romano cheese
2 to 3 tbsp. butter, at room temp.
1 to 2 tbsp. boiling pasta water

Mix basil leaves, oil, nuts, garlic and salt in a blender or food processor on high speed. Beat in cheeses and then butter by hand. Just before serving, add 1 or 2 teaspoons of boiling pasta water for consistency. Add to cooked pasta immediately.

Makes 4 to 6 servings.