Grilled Okinawan Purple Sweet Potato Skewers with Miso Glaze

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Charred and sweet Okinawan purple sweet potato cubes glazed with a rich miso sauce, grilled to smoky perfection for a unique side or snack. This japanese-inspired vegetarian (vegetarian) ready in about 30 minutes pairs Okinawan purple sweet potato, white miso paste, mirin for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 220 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 15 min Serves 4 Japanese cuisine 220 cal/serving
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Ingredients

Instructions

  1. Step 1: Peel and cut 400 g Okinawan purple sweet potato into 1-inch cubes. Boil in salted water for 8 minutes until just tender but not falling apart. Drain and cool slightly.
  2. Step 2: In a small bowl, whisk together 3 tbsp white miso paste, 2 tbsp mirin, 1 tbsp sake, and 1 tbsp brown sugar until smooth and glossy.
  3. Step 3: Thread the sweet potato cubes evenly onto 6 soaked wooden skewers, about 5 cubes per skewer.
  4. Step 4: Preheat a grill pan or outdoor grill to medium-high heat (around 400°F). Brush the sweet potato cubes generously with 2 tbsp vegetable oil.
  5. Step 5: Place the skewers on the grill and cook for 3 minutes per side, brushing with the miso glaze after flipping, until the sweet potatoes are nicely charred and the glaze caramelizes slightly.
  6. Step 6: Remove from grill and serve warm as a flavorful side dish or snack.

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Frequently asked questions

How long does Grilled Okinawan Purple Sweet Potato Skewers with Miso Glaze take to make?

Total time is about 30 minutes (15 min prep + 15 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Grilled Okinawan Purple Sweet Potato Skewers with Miso Glaze?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep okinawan purple sweet potato from drying out.

Can I substitute ingredients in Grilled Okinawan Purple Sweet Potato Skewers with Miso Glaze?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Grilled Okinawan Purple Sweet Potato Skewers with Miso Glaze for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Grilled Okinawan Purple Sweet Potato Skewers with Miso Glaze vegetarian?

Yes — this recipe is tagged vegetarian based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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