Optional to add smoke flavor: Warm up smoker to 350F.
In a large pot, boil the peeled beets with water and a lid to accelerate cooking.
Once beets are tender (you can insert a fork into the beet easily), strain liquid add apple cider vinegar to the beets, gently toss and allow the beets to cool.
Meanwhile, by hand or using a food processor, finely dice granny smith into 1/8” inch. Toss diced granny smith apples in lemon juice and set aside.
By hand or using a food processor, finely dice cooked beets into 1/8” inch.
Season dice cooked beets with kosher salt.
Optional to add smoke flavor: Place diced cooked beets into foil pan and put into smoke for flavor for 20 minutes, stirring every 5-20 minutes.