Make Crab Cake Batter
In a food processor (use a medium-size food processor, a mini processor, or a blender), combine the egg yolk, lemon juice, Worcestershire, Tabasco, mustard, paprika, thyme, celery seed, and black pepper.  
Pulse to combine.  
With the motor running, slowly add the oil through the feed tube until the mixture emulsifies and forms a mayonnaise.  
Remove the mayonnaise from the food processor and set aside.
Put the breadcrumbs in a shallow container and mix in ½ cup of the chopped parsley (reserve the remaining ¼ cup chopped parsley for the crab cake mixture). Set aside.
In a large bowl, combine the onion and bell peppers with the remaining ¼ cup parsley.  
Add the reserved mayonnaise and the crabmeat and mix lightly to combine.  
Using a rubber spatula, fold in 1 cup of the breadcrumb-parsley mixture.  Do not overwork the mixture or the crab cakes may get gummy.  
Gently form eight patties and dredge the patties lightly in the remaining breadcrumb-parsley mixture.  If you have time, cover the crab cakes with plastic wrap and chill for an hour or longer.

Cook Crab Cakes
Place two large nonstick skillets over medium heat and add about 2 ½ tablespoons butter to each pan.  
As soon as the butter is melted, add four cakes to each pan.
Gently fry the crab cakes until they are hot through and golden brown on both sides, turning once with a spatula, about 4 minutes per side.

To Serve
Transfer the crab cakes to four plates and serve each plate with a ramekin of green cocktail sauce and a lemon wedge.

Recipe and photo by Chef Tom Douglas, Seattle Kitchen