Heat 1/2 of oil over high heat. Saute onions, bell peppers, salt, white pepper and about 15 turns of fresh ground black pepper for about a minute. Add green onions, garlic, Cajun choice seasoning and cook for another minute. Remove and put in bowl. Cool mixture for a few minutes. Stir in 2 eggs, Dijon mustard, 1/4 cup of bread crumbs and Parmesan cheese. Then add crab meat depending on size of crabcake. Gently mix the mixture and form into crab cakes. First dip both sides in flour, then in egg/water (egg and 1/4 cup water whisked together). Cover in bread crumbs and fry about 2 minutes on each side over medium heat.
For the Sauce for the Crab Cakes: Combine everything in a pan except egg, oil, and black pepper over high heat bring to a boil for about 2 minutes. Remove from the heat and let cool for 15 minutes. Put in blender and add egg. While blending add oil and black pepper about 10 turns. Serve immediately.
*RAW EGG WARNING
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