Prepare the grill for direct cooking over low heat (120° to 180°C) and preheat the grill pan.
In a large bowl whisk the oil, sage, thyme, salt, and pepper. Add the squash, apple, sweet potato, and onion pieces and toss to coat evenly.
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Chopping Thyme
Spread the squash and sweet potato in a single layer on the grill pan. Scatter the apple and onion on top. Grill over direct low heat, with the lid closed, until tender, 20 to 25 minutes, mixing occasionally, separating the red onion layers as they soften. Transfer to a serving bowl and stir in the orange zest. Serve warm.
Spread the squash and sweet potato in a single layer on the grill pan. Scatter the apple and onion on top. Grill over low heat, with the lid closed, until tender, 20 to 25 minutes, mixing occasionally, separating the red onion layers as they soften. Transfer to a serving bowl and stir in the orange zest. Serve warm.