How to Make It
Pour oil to depth of 3 inches into a Dutch oven; heat to 360°. Whisk together evaporated milk, 1 egg, and 1/4 cup water in a large bowl.
Rinse crabs, pat dry, and sprinkle with seasoned salt. Dredge crabs in flour; dip in evaporated milk mixture, and dredge in flour again. Fry crabs, in 2 batches, in hot oil 2 minutes on each side or until golden brown. Drain on a wire rack over paper towels. Keep warm.
Preheat oven to 375°. Brush 1 side of each bread slice with butter. Bake bread slices, buttered sides up, 5 minutes or until toasted.
Prepare hollandaise sauce mix according to package directions, omitting butter and using 1 cup milk and 1 Tbsp. lemon juice.
Pour water to depth of 2 inches into a large saucepan. Bring to a boil; reduce heat, and maintain at a light simmer. Add vinegar. Break remaining 6 eggs, and slip into water, 1 at a time, as close as possible to surface. Simmer 3 to 5 minutes or to desired degree of doneness. Remove with a slotted spoon. Trim edges, if desired.
Top bread slices with arugula, fried crabs, poached eggs, and hollandaise sauce. Sprinkle with chives and salt and pepper to taste.