To prepare the vegetables in an electric pressure cooker (
this is our favorite), place the prepared veggies in the pot of the pressure cooker and add 1 cup chicken broth. Use the manual setting for 8 minutes, then use the quick release. While the vegetables are cooking, whisk together the vinegar, oil, and mustard. (If you aren’t using a pressure cooker, steam them in the chicken broth on the stovetop or microwave).