In a small pot, combine 1/2 cup farro with 1 cup water. Bring to a boil then reduce to low, cover and simmer for about 20 minutes.
Meanwhile prepare the dressing by whisking together the yogurt, lemon juice and salt in a small bowl.
In a large bowl, combine the apples, fennel and red onion. Pour half of the dressing on top and toss to combine.
When the farro is done cooking, add it to the small bowl (with the remaining dressing) while still warm then stir until evenly coated. Transfer it to the bowl with the apples and fennel then toss together. Serve over a bed of massaged kale or as is and enjoy!