3 (15-ounce) cans black beans, drained and rinsed
1 (15-ounce) can whole-kernel corn (or about 1 1/2 cups fresh corn)
1/2 medium cucumber, finely diced
1 cup chopped cilantro
2 to 3 limes, juiced
1/2 cup chopped celery or green onions
1 to 2 cups crumbled feta
1/3 cup red wine vinegar
Sea salt, cracked black pepper, and cumin to taste
Combine the black beans, corn, cucumber, cilantro, celery, and feta in a large bowl and toss until mixed evenly. Add lime juice and vinegar, stir, and taste. You may want to add more lime to taste. Add a dash of salt, pepper, and cumin, and adjust to taste.
Chill for at least one hour before serving.