Potato Pancakes with Smoked Sturgeon

Name: Potato Pancakes with Smoked Sturgeon
Ingredients: 1 pound organic russet potatoes, peeled; 1 small onion; 1 egg, preferably cage-free, beaten; 2 tablespoons all-purpose flour; ½ teaspoon baking powder; ¾ teaspoon kosher salt, plus more to taste; ¼ teaspoon freshly ground pepper, plus more to taste; Cooking oil, such as canola, peanut, or safflower, for frying; 1 ½ cups crème fraîche or sour cream; 2 tablespoons fresh dill, minced; Lemon juice, to taste; ½ pound smoked sturgeon, separated into large flakes, skin and bones removed*; Osetra caviar, for garnish