To make the dressing, whisk together mayonnaise, ketchup, cayenne, dry mustard, shallot, lemon juice, and parsley. Season the dressing with salt and pepper. Fold in the crabmeat and capers, turn to coat. Using a clear parfait glass or champagne glass, scoop a heaping tablespoon of the diced mangoes on the bottom of the glass. Press down slightly with a spoon. Add a layer of crabmeat on top, pressing down again, followed by a layer of chopped mixed greens. Repeat the layers. After the last layer of greens, spoon a final mound of crab salad on top. Repeat with remaining 3 glasses. Serve with toasted baguette slices.
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