Smoked Okinawan Sweet Potatoes

Begin by selecting 6 medium Okinawan sweet potatoes, ensuring they are firm and free of soft spots. Scrub the beige skins thoroughly under cold running water to remove any volcanic soil or debris. Use a clean kitchen towel to pat each potato completely dry; surface moisture is the enemy of smoke adhesion and will cause the skins to steam rather than develop a savory, smoke-kissed texture.

Using a fork or small paring knife, prick each potato 4 to 6 times across all sides, penetrating about half an inch deep. Because Okinawan sweet potatoes are significantly denser than orange-fleshed varieties, these pathways are critical. They allow internal steam to escape safely—preventing the potatoes from bursting—while providing a direct channel for the guava wood smoke to reach the deep purple starch.

Drizzle approximately 1 teaspoon of neutral oil over each potato and rub manually until the entire surface is lightly coated and glistening. Immediately follow with a generous sprinkle of Hawaiian sea salt, rotating each potato to ensure the coarse grains adhere to the oily surface. This salt-oil barrier seasons the skin and draws out just enough moisture to create a thin, crispy exterior during the long smoke.

Preheat your smoker to a consistent 275°F using guava wood or a mild fruitwood like apple or cherry. Ensure you have a clean, blue smoke (combustion) rather than heavy white smoke to avoid acrid flavors. Place the 6 potatoes directly on the grill grates in a zone of indirect heat, ensuring a minimum 2-inch gap between each potato to facilitate proper convective airflow and 360-degree smoke coverage.

Close the lid and smoke the potatoes for roughly 90 to 105 minutes. During this time, the dry heat will slowly convert the complex starches into maltose, deepening the color of the purple flesh. Resist the urge to open the lid frequently, as heat recovery on many smokers can significantly delay the cooking of these dense tubers. Check the smoker temperature periodically to maintain the 275°F target.

Test for doneness by inserting a metal skewer or thin knife into the center of the largest potato. It must offer zero resistance—sliding in like it is hitting softened butter. Because these potatoes have less moisture than orange varieties, they stay 'chalky' until they reach an internal temperature of roughly 205°F to 210°F. If there is any 'snap' or resistance, continue smoking in 15-minute increments.

While the potatoes finish on the smoker, prepare the topping. In a small bowl, combine 2 tablespoons of softened butter with 1 tablespoon of honey or coconut sugar. Use a fork to vigorously whip the mixture until it is smooth and aerated. This optional but recommended finish provides the necessary fat and floral sweetness to balance the earthy, chestnut-like notes of the smoked purple yam.

Remove the potatoes from the smoker and let them rest on a wire rack for 5 to 10 minutes. This pause allows the internal pressure to stabilize and ensures that the carryover heat finishes the very center of the starch. Do not wrap them in foil during the rest, as this will trap steam and soften the crisp skin you worked to achieve on the smoker.

Slice each potato lengthwise down the center, being careful of the escaping steam. Gently squeeze the ends toward the middle to 'pop' the vibrant purple flesh. Top each hot potato with a dollop of the honey-butter mixture and a final pinch of Hawaiian sea salt. The salt will make the purple color pop visually while cutting through the richness of the butter.