In a blender or food processor, combine the mayonnaise, cream cheese, onion, chives, vinegar, Worcestershire sauce, garlic and seasonings. Cover and process until blended. Cover and refrigerate for 24 hours. , Using a 2-1/2-in. biscuit cutter, cut out circles from bread slices. Spread mayonnaise mixture over bread; top with cucumber slices. Garnish with pimientos and dill.