Put the sweet potatoes in a steamer basket and put the steamer in a large pot of simmering water that is 1 inch from the bottom of the basket. Cover and steam over medium-high heat for 20 minutes, or until the sweet potatoes are fork-tender.
Remove the steamer basket, pour the water out of the pot and dump the sweet potatoes into the pot. Add the butter and salt and mash with a potato masher. Add the chile and sauce and continue mashing to combine. Serve immediately.