Almond-Crusted Shrimp Cakes With Lemon Soy Mayonnaise

Stir together all mayonnaise ingredients in a small bowl. Chill until ready to serve.
Pulse chopped bacon in food processor until finely chopped. Pat shrimp dry, then add to bacon and pulse just until shrimp is coarsely chopped (do not puree). Soak bread in milk in a shallow bowl until very soft, about 30 seconds. Add wet bread to shrimp mixture, discarding any remaining milk, and pulse until just combined.
Transfer shrimp mixture to a bowl, then stir in scallions, cilantro, cornstarch, salt, sugar, and pepper until combined well.
Spread almonds on a large plate. Using a 1/4-cup measure, drop 1 mound of shrimp mixture onto almonds. Sprinkle almonds over shrimp mound to coat, gently pressing to form a (3 1/2-inch) cake (1/3 inch thick). Transfer cake to a wax-paper-lined baking sheet. Make 7 more cakes in same manner, transferring to baking sheet. Discard any remaining almonds.
Heat 2 tablespoons oil in a 12-inch heavy skillet over moderate heat until hot but not smoking, then cook 4 cakes, turning over once and rotating for even browning, until almonds are golden and cakes are just cooked through, 4 to 6 minutes total. Transfer to a paper-towel-lined plate and keep warm, loosely covered with foil. Discard any almonds left in skillet, then add remaining tablespoon oil and cook remaining 4 cakes in same manner. Serve warm, with lemon soy mayonnaise.