Pickled Onions & Radishes
from https://www.cuisineathome.com/

It doesn't take long to make Pickled Onions & Radishes, and they add bright flavor and a delightful crunch to tacos, salads, and other Mexican dishes.

½ cup fresh lime juice
2 Tbsp. sugar
1 tsp. kosher salt
1 ½ cups thinly sliced white onions
1 ½ cups thinly sliced radishes (about 1 bunch)
1 cup chopped fresh cilantro (1 bunch)

Whisk together lime juice, sugar, and salt until dissolved.

Add onions and radishes, tossing to coat; chill 2 hours, tossing occasionally. Stir in cilantro just before serving.