Open cans of chickpeas and black beans. Drain in a colander and rinse under cold water for 30 seconds while gently stirring. Shake colander to remove excess water.
1 can chickpeas, 1 can black beans
Dice red onion into ¼-inch pieces and submerge in a bowl of ice water for 10 minutes. Drain and pat dry with a towel.
0.5 red onion
Remove stems from parsley and mint leaves and chop finely to about ⅛-inch pieces.
1 cup fresh parsley, 0.5 cup fresh mint
Whisk lemon juice, olive oil, ground cumin, salt, and black pepper in a large mixing bowl. Add rinsed beans and drained onions, then toss gently to coat without mashing the beans.
2 tablespoons lemon juice, 3 tablespoons olive oil, 1 teaspoon ground cumin, 1 teaspoon salt, 0.5 teaspoon black pepper, 1 can chickpeas, 1 can black beans, 0.5 red onion
Fold in chopped parsley and mint. Cover and refrigerate at least 30 minutes to meld flavors. Add cherry tomatoes just before serving to avoid watery salad.
1 cup fresh parsley, 0.5 cup fresh mint, 1 cup cherry tomatoes