01 -
In a medium skillet, combine vinegar, sugar, and salt. Bring to a boil, whisking to dissolve sugar. Add onion slices, reduce to a simmer, and cook until slightly wilted, 1 to 2 minutes. Transfer onions with pickling liquid to a heatproof bowl to cool.
02 -
Bring a large pot of salted water to a boil. Add corn, cover, and reduce heat to low. Simmer for 10 minutes, then remove and let cool.
03 -
Hold cooled corn upright in a mixing bowl and cut kernels off the cob in strips.
04 -
To the bowl with corn, add beans, scallions, cilantro, 5 tablespoons oil, lime juice, lemon juice, 1/2 teaspoon salt, and cumin. Toss well and set aside.
05 -
In a large skillet, heat remaining 3 tablespoons oil over medium-high heat. Add shrimp and season with remaining 1/4 teaspoon salt. Cook for 1 minute, add garlic, and cook until shrimp are opaque, 1 to 2 minutes.
06 -
Transfer shrimp and garlicky oil to salad bowl. Toss gently, taste, and adjust seasoning. Top with crumbled feta, extra cilantro, and pepper. Serve with pickled onions on the side.