In medium bowl, mash avocado, lime zest and juice; season. In small bowl, mix jalapeño, vinegar and sugar. In skillet, heat oil over medium-high. Cook seasoned scallops until browned, about 2 minutes; turn and cook until opaque in centers, about 1 minute. Divide avocado mixture among plates; top with scallops, radishes, jalapeño and cilantro.
Bonus: How do you store avocados? Put whole ripe avocados in the fridge and they’ll stay fresh for up to a week.