Peel the sweet potatoes and cut them into cubes.
Put the potatoes in a pot and cover with water. Bring the pot to a boil over high heat.
Continue to boil the potatoes for 15 to 20 minutes, until the potatoes are easily pierced with a fork.
While the potatoes are cooking, zest and juice 1 orange.
When the potatoes are done cooking, drain the water out of the pot.
Add the orange zest, orange juice, brown sugar and cinnamon to the pot along with the cooked sweet potatoes.
Mash it all up with a potato masher.