How to Make It
Place 1/2 cup peas in a bowl; set aside. Place remaining peas in a food processor; pulse until coarsely mashed. Combine mashed peas, panko, 3 tablespoons onions, 1/2 teaspoon salt, red pepper, and eggs in a bowl. Divide and shape pea mixture into 8 (3-inch) patties.
Heat 1 tablespoon oil in a large nonstick skillet over medium. Add 4 patties to pan; cook 5 minutes on each side. Remove patties from pan; keep warm. Repeat procedure with remaining 1 tablespoon oil and remaining 4 patties.
Increase heat to medium-high. Add corn to pan; cook 2 minutes. Place corn in a bowl; let stand 5 minutes.
Add reserved 1/2 cup peas, remaining 1 tablespoon onions, remaining 1/4 teaspoon salt, tomatoes, and remaining ingredients to corn, stirring to combine. Spoon evenly over cakes.