In a medium sized bowl, combine mayonnaise, pesto, lemon juice, and lemon zest.
Mix well to combine, ensuring aioli is fully incorporated and no lumps remain.
Use a clear spoon to taste test; add salt and pepper as necessary.
Store dip in refrigerator in an airtight container if not serving immediately. Aioli will last for up to 4 days in the refrigerator once in airtight container.
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