Bring water to a boil in a pot with some salt.
Remove the root from the beets and dice them. Add the beets to the boiling water. Lower the heat and let them shimmer for 25-35 minutes, until they are al dente or soft (depending on how you prefer them).
Preheat the oven to 200 degrees Celsius.
Cut the sweet potato into wedges and place on a parchment covered baking sheet. Sprinkle with olive oil (if using, I did not use it). Bake for 15-20 minutes, until soft and golden brown.
When the beets are done drain them and run under water for a few seconds. Let them cool for just a few seconds then remove the peel.
Place green leafs on a plate.
Top with baked sweet potatoes, cooked beets, capers, crumbled feta cheese, lemon juice and chopped mint leafs. Serve warm!