Ingredients 6   russet potatoes 1 ½   teaspoons   olive oil 1   teaspoon   coarse salt 2   yellow onions   approximately 1.5 pounds/600 grams 2   tablespoons   olive oil ½  teaspoon   kosher salt ¼  teaspoon   ground black pepper ½  teaspoon   thyme leaves   3 long stems ½   cup  water …