Make the tartar sauce. Combine 1 cup mayonnaise, 2 Tbsp sweet pickle relish, 2 Tbsp shallots, 1 tsp Dijon, 2-3 Tbsp lemon juice, ¾ tsp Kosher salt, and ¼ tsp black pepper in a large bowl, then whisk to combine. Refrigerate until ready to use.
Mix wet ingredients and spices. Combine 1 egg, 2 Tbsp mayonnaise, 2 tsp Old Bay, 2 tsp Dijon, 1 tsp Worcestershire, 2 Tbsp parsley, 2 Tbsp dill, 1 tsp salt, and ¼ tsp pepper in a large mixing bowl, then whisk well.
Form the crab cake mixture. Add 1 lb crab meat and ⅔ cup Ritz cracker crumbs, then mix gently until just combined.
Portion the crab cakes. Use a large cookie scoop to portion mixture into equal size crab cakes. One pound of crab meat will yield 7 crab cakes. Place on a parchment lined baking sheet, then refrigerate for 30 minutes (or up to 1 day).
Cook the crab cakes. When ready, gently form the crab cakes into uniform size and shape, pressing down slightly and smoothing the edges to form a flat, round circle. Heat 2 Tbsp unsalted butter over medium heat in a large skillet. Cook crab cakes for 2-3 minutes per side, or until golden brown and crispy.
Serve immediately. Crab cakes are best served hot from the skillet. Enjoy over a salad or, as shown here, on brioche buns with tartar sauce, sliced tomatoes, and avocado. Don't forget a pinch of flaky sea salt, always!