Instructions
Step 1
Heat oven to 350 °F.
Step 2
In an oven-proof casserole, combine olive oil, butter, sea salt, black pepper, and thyme. Add potatoes and toss to coat. Roast for 20 minutes.
Step 3
Remove from the oven and sprinkle the dashi evenly over the potatoes. Toss to coat, then return to the oven. Roast for another 15–20 minutes, turning occasionally, until golden and crisp. Serve warm.