In a large mixing bowl, combine all ingredients together except for saltine crackers and blue crab meat. Add the blue crab meat and finely crushed saltine crackers, gently folding the mixture together until combined. Shape into 6 crab cakes and place on foil-lined baking sheet. Cover and freeze for 30 minutes to allow crab cakes to firm up. Preheat a large nonstick pan over medium heat and coat with oil or butter. Once the oil is hot, fry crab cakes on pan until lightly browned. Serve the crab cakes with freshly sliced tomatoes and mayonnaise. Enjoy!