Place all ingredients except 1 cup black peppercorns in food processor and grind very fine. Add remaining olive oil and blend a few seconds until very smooth.
Ingredients
12 Walnuts, shelled
2 tb Pine nuts
1 ts Coarse salt
4 (or 5) black peppercorns
3 Garlic clove(s)
4 tb Butter
3 c Basil leaves
4 oz Grated Parmesan cheese
4 oz Grated Romano cheese or added Parmesan cheese
1 1/2 c Olive oil