Caramelized Onion with grain

2 lbs russet potatoes , peeled and cut into chunks 1/3 cup half-and-half 2 tablespoons butter 1 -2 tablespoon coarse grain mustard 1/4-1/2 cup caramelized[...]

1 teaspoon oil (I use flavoured "Chili Oil") 1 large sweet onion , thinly sliced (Walla Walla type) 2 garlic cloves , smashed 1/8 teaspoon cayenne pepper 1[...]