Cucumber, Radish, and Tomato Salad with Citrus Dressing Recipe

2 tablespoons fresh lemon juice
2 tablespoons fresh lime juice
1 garlic clove, minced and mashed to a paste with 1/4 teaspoon salt
1/4 cup olive oil
1/3 cup finely chopped fresh coriander, or to taste, plus coriander sprigs for garnish
2 tomatoes (about 1 1/4 pounds), seeded and chopped fine
2 cucumbers, peeled, seeded, and chopped fine (about 2 1/2 cups)
3/4 pound radishes, trimmed and chopped fine
6 scallions, sliced thin

In a large bowl whisk together the juices and garlic paste, add the oil in a stream, whisking, and whisk the dressing until it is emulsified. Whisk in the chopped coriander and salt and pepper to taste. Add the tomatoes, the cucumbers, the radishes, and the scallions, toss the salad to combine it well, and garnish it with the coriander sprigs.