Bring 6 cups of water to a boil in a large pot, then add barley and salt.

Reduce heat, cover, and simmer for 40 minutes or until barley is tender.

Drain the barley and rinse with cold water until completely cooled.

Drain the barley well.

Combine white wine vinegar, garlic, jalapeno, cilantro, and vegetable oil in a blender.

Blend until smooth to create the dressing.

Season the dressing to taste with salt and pepper.

In a large bowl, combine the cooked barley and the dressing, mixing well.

Stir in scallions, corn, and tomatoes.

Season the salad to taste with additional salt and pepper if needed.

Cover and chill the salad before serving.