First, chop the beet stems into 2-inch pieces and chop the dark, leafy greens of the beets into bite-sized pieces.
Next, dice the onion.
Then, add a sprinkling of salt to the garlic and smash to make a paste.
Heat oil in a saute pan and saute the onion and garlic until soft and they start to take on a golden color.
Add the chopped beet stems to the pan and stir to saute them for 3-4 minutes or until they start to soften.
Add the chopped beet greens to the pan and allow them to wilt for 1-2 minutes, stirring occasionally.
Season with red pepper flake, lemon juice and zest, if using.
Season with salt and pepper to taste and garnish with parmesan cheese, if using.