In a medium sauté pan, add 1 teaspoon vegetable oil and cook bacon over medium heat until soft. Add shallots and cook until transparent.
Remove pan from heat; stir in vinegar. Add parsley, mustard powder, chicken bouillon, and sea salt and freshly ground whole black peppercorns to taste.
Boil potatoes until done but firm; drain. Add vinegar mixture to warm potatoes in a large bowl. Toss well and allow to rest for 5 minutes.
Add 1/3 cup vegetable oil and mix well again. Adjust seasoning; serve at room temperature.