If you’re making these Rainbow Veggie Sandwiches ahead, we recommend whisking together the dressing for the arugula separately, assembling the sandwiches, and drizzling on the dressing right before eating.

If you’re making these Rainbow Veggie Sandwiches ahead, we recommend whisking together the dressing for the arugula separately, assembling the sandwiches, and drizzling on the dressing right before eating.