Arrows of Burning Heat
This is a short and simple sidequest that can be found in Kakariko Village. Speak to the owner of the arrow shop, Rola. She will give you a challenge. Say yes to it to accept this sidquest.
Her challenge involves the goddess statue located in Kakariko Village near its center. If you go to it you will see a nearby campfire (if it's not raining) and four torches surrounding the goddess statue.
Complete this sidequest by lighting the four torches on fire. However, you have to do it by dipping an arrow into the campfire and firing it at the torches. Once they are all lit, go back and talk to Rola for your reward, 20 rupees.