Preheat the oven to 395 degrees. Meanwhile, line a baking sheet with parchment paper. 

Place the beets onto the baking tray and bake for about 40 minutes, until fork tender. Cool the beets for about 20 to 30 minutes until easily handled. Peel the beets and discard the peels. Julienne the beets, cutting them into 2 inch slices that are ⅛-inch thick.

Place the beets, cabbage, dates, jalapeño (if using) and cilantro or scallions, salt, olive oil and lemon juice into a bowl and mix well. Taste and adjust the seasoning as needed. Serve immediately.