1. In a large pan, combine the wheat berries, salt, and about 8 cups of water. Bring to a boil, reduce the heat to medium, and briskly simmer for about 1 hour, or until the wheat berries are chewy. Drain and rinse with cold water.
2. Whisk together the orange juice, zest, lemon juice, shallot, olive oil, and pepper in a small bowl, and set aside.
3. In a large bowl, toss together the wheat berries, orange juice mix, almonds, feta, spinach, and tomatoes.