Blanch potatoes in salted boiling water, until fork tender, about 10-20 minutes, depending on size.
Mash black garlic with a fork with salt and olive oil until it becomes a chunky paste. Add the remaining oil, vinegar, dijon and black pepper and whisk into a dressing.
Preheat the grill to med- high, and grease it.
Strain the tender potatoes, and toss with 1 tablespoon of the dressing just enough to lightly coat.
Grill the potatoes until nicely charred on all sides.
Place in a bowl toss with the rest of the dressing and taste, adjust salt and pepper to taste. If too, vinegary, add a little sugar or honey and stir this in.
Sprinkle with fresh herbs and serve warm, room temp or chilled.
