Garnet red is the most common color for beets. However, their color can range from white to deep purple-red. Try the Chioggia, or candy cane beet, which has alternating rings of red and white.
Developed in Denmark, Havarti is a semisoft, pale yellow cheese marked with small irregular holes. The mild, buttery flavor of Havarti contrasts well with the sweetness of the beets and sharpness of mustard in this salad.
To enhance the flavor and texture of the walnuts in this salad, toast them in a 350°F. oven until they are golden, about 10 minutes. Let the toasted walnuts cool completely before adding them to the salad.