This all comes together under mortar and pestle.
1. Finely chop the parsley, mint, and basil, then put into a bowl and cover with olive oil.
2. Peel the garlic and chop with the capers and anchovy. Add to the herbs and mix together.
3. Stir in the mustard and vinegar, season with black pepper, and add more olive oil to loosen the sauce.
Originally featured in Cooking at the River Café