Basic Amazing Crab Cakes

1 lb. fresh Maine lump crabmeat (check for shells)1/4 cup mayonnaise2 large eggs1 tbsp lemon juice1 tsp lemon zest1/2 tsp kosher salt2 scallions (sliced thin)1 celery (large stalk, sliced thin)1 3/4 cups panko bread crumbs3 tbsp olive oil2 tbsp fresh parsley...