Spinach Salad with Strawberries, Candied Walnuts, Feta, and Pomegranate Seeds

walnut pieces 1 tsp of white sugar Pinch of cardamon 3 cups of baby spinach 2 cups of romaine lettuce, chopped 1 cup of sliced strawberries 2-3 tbsp feta cheese 2-3 tbsp pomegranate seeds Balsamic Dijon Vinaigrette (see recipe link above)