In a small sauce pot add the white wine vinegar, sugar, coriander, black pepper, dill seed, and bay leaves. Turn on high heat and bring to a boil.
Peel and slice the shallots into 1/4" rounds and set into a seal-able container with the lid off.
Carefully pour the hot pickling through a fine mesh strainer.
Cover the shallots with the hot pickling, cover and store in the refrigerator for up to 10 days
To assemble the salad:
Slice the Yukon gold potatoes about 1/4" thick and place in a pot of cold water with 1 Tbsp sea salt and turn on high heat. Once the water begins to boil turn heat to low and simmer until the potatoes are tender but not falling apart. Strain the potatoes and place on a sheet pan to cool while you prepare the other ingredients. Dice the bacon and put it into a large sauce pan on medium heat, once the bacon begins to get some color, add the potatoes, shallots, mustard vinaigrette, and pepper.
Once the potatoes are warm and have a little bit of browning add the parsley toss and serve.