Given the task definition and input, reply with output. In this task, you will be presented with the directions of a recipe separated by "," and have to fill in the "___" which is a step that is missing from the recipe.

Thinly slice cucumbers and onions (I use a mandoline).,______,Rinse the cucumbers.,Combine the remaining ingredients, stir until all the sugar has dissolved (I usually double this part).,Pour over cucumbers and onions.,Refrigerate at least 4 hours or make the day before.
Soak the cucumbers in salted ice water for an hour.