In a saucepan of water, boil the potatoes until tender. This takes approximately 5 minutes. Check them with a knife to make sure they are done in the middle. Alternatively, you can steam the potato slices in a pressure cooker for 3 minutes on high pressure.
While the potatoes cook, mix the dressing ingredients together - olive oil, balsamic vinegar, mustard and herbs.
Drain the potatoes, pour on the dressing and mix together.
Season with salt and pepper to taste.
This salad is a quick and easy dish to make for events. Simply scale up to suit the occasion. You can make it in advance and keep it in the fridge. In fact, it can be even nicer, as the flavour has time to develop.