½ Cup rice vinegar
2 Tablespoons sugar
1 1/2 Teaspoons Kosher Salt
1 Seedless cucumber, thinly sliced
½ Red onion, thinly sliced
Bring the vinegar, sugar, and 1 ½ teaspoons salt to a boil in a small saucepan, stirring.
Remove from the heat; stir ¼ cup ice cubes until melted.
Toss the cucumber and red onion in a serving bowl with the vinegar mixture.
Place in the refrigerator.