Step 1

Preheat the oven to 400 degrees F.

Step 2

Place 2 – 14 x 20 baking sheets into the oven to heat.

Step 3

Cut 3 large sweet potatoes into 1 inch cubes, skins on. Place into a large bowl.  Sprinkle with sea salt and freshly cracked pepper.

Step 4

When the oven is hot and both the baking sheets are hot, carefully remove one sheet pan and dump the cut-up sweet potatoes onto the baking sheet and spread out evenly. The potatoes should sizzle when hitting the hot baking sheet.  This is what you are looking for.

Step 5

Next, remove the other hot baking sheet from the over and place it on top of the sweet potatoes. This baking sheet will fit down on top of the potatoes creating somewhat of a seal.  This will allow the sweet potatoes to steam and roast at the same time and prevent them from drying out.

Step 6

Carefully place the baking sheets back into the oven and bake for 17 minutes.

Step 7

In the meantime, make the Tahini Sauce by combining all the ingredients into a small bowl and whisking until smooth. Refrigerate until you are ready to use.

Step 8

After 17 minutes, remove the sweet potatoes from the oven; test the potatoes to see if they are done by sliding a sharp knife into a larger potato. If the knife slides in cleanly, they are done.  If not done, replace the top baking sheet and return to the oven for another 5-7 minutes until tender.

Step 9

When the potatoes are done, remove the baking sheet from the oven and remove the top baking sheet. Move the oven rack to the top of the oven, set the oven to high broil, and return the sweet potatoes to the oven (minus the top baking sheet) and place directly under the broiler and broil on high for 5 minutes.  You are looking to get a brown crust on the top.  This takes about 5 minutes.

Step 10

Once the potatoes are lightly browned, remove from the oven. Take a very thin edged spatula and run it under hot water, then flip it upside-down and quickly run the spatula underneath the potatoes to loosen them from the baking sheet.

Step 11

To serve, place a layer of sweet potatoes on a wide plate, then sprinkle generously with green onions, then lay down another layer of sweet potatoes and then generously sprinkle with green onions, finish with remaining sweet potatoes, then generously sprinkle with green onions. Drizzle the tahini sauce over the sweet potatoes and green onions.