INGREDIENTS:
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2 to 3 large garlic cloves
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1 1/2 to 2 tablespoons coarsely ground black pepper
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1 tablespoon grated lemon zest
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1/3 cup fresh lemon juice
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1 tablespoon white-wine vinegar
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1 tablespoon Dijon mustard
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3/4 cup extra-virgin olive oil
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1/4 cup chopped fresh tarragon or basil (optional)
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Mince garlic, then mash to a paste with 3/4 teaspoon salt.
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Whisk together garlic paste, pepper, lemon zest and juice, vinegar, and mustard, then whisk in oil until emulsified.
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Whisk in herb, if using.