Preheat the oven to 425 degrees Fahrenheit.
Line a baking sheet with 3/4 of the cup of salt in one even layer.
Place the beets in a colander and wash them under running water. Then, place them in a single layer on the salt bed. Sprinkle the remaining salt on top of the wet beets.
Place the baking sheet in the oven and roast for 35-55 minutes (the roasting time will depend on your oven and the size of your beets). Cook until the beets are tender, and when you insert a knife into the beets, you have little to no resistance. Also, fresh beets tend to cook quicker than store-bought grocery store beets. You can take the tray out and test small beets for around 35 minutes. If there is still resistance, place the sheet tray back in the oven and continue roasting for another ten minutes.
Once the beets are fully cooked, remove them from the oven and allow them to cool slightly for 10-15 minutes at room temperature.
While the beets are still warm, use a paring knife and carefully peel off their skins. Make sure that the peeled beets do not land back into the salt bed! You want to peel the beets and place them on a clean cutting board. Discard the salt bed. The beets hold a large amount of pigment and will slightly stain your cutting board and hands. You can also wear gloves for this process.
Depending on their size, cut the beets into quarters or eighths. Then, place the chopped beets in an airtight container. Repeat this process with all the beets.
Add the red wine vinegar to the chopped beets and Toss to coat the beets with the vinegar, or mix with a spoon or shake the container with the lid on over the sink.
You can keep these beets in your refrigerator for up to a week! The beauty of this recipe is that the flavor develops the more the beets sit in the vinegar as you create pickled beets.