Combine the barley with 2 1/2 cups of water and bring it to a boil. Cover and let it simmer for 30 minutes or until the barley is soft and chewy. Drain any excess water.
Massage the oil and salt into the chopped kale leaves.
Peel and segment the grapefruit and cut the slices into thirds.
Toss the grapefruit pieces into the kale, letting the juices mix, and let it sit for 15 minutes.
Mix the yogurt with the onions and cumin and combine it with kale. Salt and pepper to taste.
Serve the kale salad over the warm barley and top with almond slices.