Preheat the oven to 425 degrees F. Line a baking sheet with parchment paper.: When the oven reaches 425 degrees F , the heat drives quick caramelization on the surface of the carrots , creating deep golden edges while preserving a tender interior. You'll notice the oven hum and the air will feel noticeably warmer when it is ready. Using parchment keeps the pan clean and prevents excessive sticking, which helps preserve those caramelized bits. A common mistake is not allowing the oven to fully preheat, which can lead to pale, undercaramelized carrots , so give the oven time to stabilize before pushing the sheet in.
Place the carrots on the sheet and toss with the olive oil and 3 tablespoons of pomegranate molasses. Sprinkle with salt and pepper. Roast for 15 minutes then toss, roasting for 10 to 15 more, or until they are caramely and soft and golden.: After tossing, each carrot should glisten with a light coating of olive oil and pomegranate molasses, which will concentrate and darken as they roast. You should be able to hear a faint sizzle when they first hit the hot pan, a good sign that caramelization has begun. Even coating matters because clumps of molasses can burn, so spread the slices in a single layer to promote even browning. Avoid overcrowding the pan, as crowded vegetables steam rather than roast, resulting in limp texture.
Remove the sheet from the oven. Drizzle the last tablespoon of molasses on top and sprinkle with herbs. Drizzle the melted butter, cover with feta and serve!: As roasting progresses you will observe the edges darkening to a warm amber and the centers yielding when pierced with a fork, releasing a sweet, earthy aroma. Tossing at the 15 minute mark exposes new surfaces to direct heat, encouraging more uniform browning. If the carrots are not soft after the full time, continue in small increments while checking for visual cues, because over roasting can lead to dry, overly crisp centers.
Remove the sheet from the oven. Drizzle the last tablespoon of molasses on top and sprinkle with herbs.: The warm carrots will accept the final drizzle, which provides a glossy tangy finish and a visual pop. The aroma will shift, adding a bright, fruity note over the deep roasted scent. Adding herbs while hot helps release their volatile oils, boosting fragrance, but wait until the carrots are off the heat so the herbs do not wilt into dullness. A frequent error is adding acidic glazes too early, which can burn in the oven and become bitter, so reserve this last tablespoon for after roasting.
Drizzle the melted butter, cover with feta and serve!: Pouring the warm browned butter over the roasted carrots creates a silky sheen and a toasted aroma that ties the dish together. The contrast between the hot carrots and the cool, crumbly feta is delightful, and the feta will soften slightly from residual heat without losing texture. Watch the butter carefully as you brown it, because it can move from nutty to burnt quickly; remove it from heat when it smells toasty and turns a light amber. Serve immediately so the textures remain distinct and the flavors are most vibrant.