Take 1 tablespoon of olive oil in a wide pan. Add the leeks and cabbage to the pan and sauté until they soften over medium heat. While the vegetables are sautéing, add 1 teaspoon of ground coriander and a pinch of salt to the pan and mix; this process will balance the sweetness of the vegetables and add depth to the quiche. Finally, add the spinach roots and sauté for another
2 minutes until the spinach wilts, then remove from the heat.