Roasted Garlic and Onion Jam with seasoning

5 tablespoons roasted garlic and sweet onion jam 1/3 cup champagne vinegar or 1/3 cup white wine vinegar 1 tablespoon Dijon mustard 1/2 cup canola oil or 1/2[...]

1 head of garlic , whole 1 white onion, sliced thin 1/4 cup pure olive oil salt and pepper 2 lbs yukon gold potatoes 1 cup unsalted butter 1 1/2 cups heavy[...]