Preheat a grill over <g class="gr_ gr_60 gr-alert gr_spell gr_inline_cards gr_disable_anim_appear ContextualSpelling ins-del multiReplace" id="60" data-gr-id="60">medium high</g> heat or heat a grill pan.
Place all dressing ingredients (start with 2 teaspoons of Dijon) in a blender and puree. Taste for seasoning. Set aside.
Lightly brush the vegetables with olive oil. Sprinkle with sea salt and black pepper to taste.
Grill each vegetable according to doneness. Each one takes a different amount of time, but plan on 2-5 minutes per side.
Arrange vegetables on a platter and serve the dressing on the side or drizzled on top.