2 avocados, pitted and peeled
1/4 cup fresh lime juice (2-3 limes)
1 tablespoon tahini
1/4 cup chopped onion
1/4 teaspoon kosher salt
1/4 teaspoon fresh pepper
Combine all in a food processor; process until smooth (about 30 seconds).
Transfer to serving dish. (To make up to 6 hours ahead, set aside 1 TBSP lime juice; drizzle over surface and cover with plastic wrap. Refrigerate.)
Garnish with fresh pepper.