Place spelt in a large saucepan; cover with water to 2 inches above spelt. Bring to a boil. Cover, reduce heat, and simmer 1 1/2 hours or until spelt is tender. Drain.
Bring 4 cups water to a boil in a medium saucepan. Add fava beans; cook 2 minutes. Drain and rinse with cold water; drain. Remove and discard tough outer skins from beans.
Combine spelt, fava beans, tomatoes, celery, and currants in a large bowl. Combine vinegar and next 4 ingredients (through garlic), stirring with a whisk. Drizzle over spelt mixture; toss well to coat. Sprinkle with parsley.