Preheat the oven to 190°C/Gas Mark 5. Put the Brussels sprouts and shallots or onions into a large roasting dish, trickle over the oil, season with salt and pepper and toss to coat, then tuck in the thyme sprigs.
Roast for about 35 minutes, giving a good stir halfway through, until everything is a bit crispy, brown and caramelised.
Squeeze some lemon juice over the roasted sprouts, along with a sprinkling of fresh thyme if you like, and serve.
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