Saute onion, fennel, garlic, ginger, red chili flakes in blended oil. Add konbu sheets and deglaze with mirin. Reduce for 5 minutes. Add rice vinegar, stock, soy, bonito flakes and simmer. Strain ingredients until all liquid is drained. In a large mixing bowl, place miso and begin to drizzle liquid (as if making a vinaigrette). When reached consistency, add yuzu to desired flavor (this process can be achieved in a blender too).