Combine the chopped cucumbers, onion, and red bell pepper in a bowl.
In a small saucepan, combine the vinegar, sugar, and salt. Cook over medium heat, stirring occasionally, until the sugar has dissolved.
Pour the vinegar mixture over the vegetables and stir to combine.
Cover the bowl and refrigerate for at least 30 minutes to allow the flavors to meld together.
Notes
Use the sweet pickle relish substitute in your recipe as you would regular sweet pickle relish.This recipe will yield a small batch of relish, so you may need to adjust the amounts depending on how much you need for your recipe.