Gently mix everything together, except the bread crumbs or flour, with your hands.
Form into patties, (about 1/3 cup mixture per patty)
Coat in Panko bread crumbs or dust with flour.
Heat oil in a large skillet, about 1/4" to 1/2" oil until shimmering.
Fry crab cakes in batches, 3-4 at a time, cooking about 4 minutes per side.
For the Lemon Tarragon Mayonnaise
Place all ingredients into a small bowl and whisk until combined.
Chill until ready to use.