6 large sweet potatoes, half of them peeled, each cut into 1 1/2 inch chunks
2 large leeks, root end and top 4 inches trimmed, sliced into 1/2 inch thick rounds, cleaned well
1/3 cup extra virgin olive oil
1/3 cup silan
Preheat oven to 400F
Cover 1-2 jelly roll pans with aluminum foil and set aside
Place the sweet potato and leeks into a large bowl. Toss with the oil to coat all the vegetables. Pour in a single layer onto the prepared pans. Roast uncovered for 30 minutes.
Remove from oven and drizzle on the silan. Be careful the pan will be hot. Coat the vegetables well. Return, uncovered to the oven and roast for an additional 15-20 minutes, until the sweet potatoes are fork tender and sticky. Toss once during the roasting time.
Immediately transfer to serving bowl.