
Fire-Roasted Onions with Thyme
Whole onions roasted in their skins over indirect heat until completely soft and sweet, then opened and dressed with thyme and olive oil.

Whole onions roasted in their skins over indirect heat until completely soft and sweet, then opened and dressed with thyme and olive oil.
smokeandsoil.com/recipes/fire-roasted-onions-with-thyme
by L Field
Prep
10 min
Cook
12 min
Total
22 min
Serves
4
Level
Hard
Method
BBQ
Ingredients
High heat transforms these vegetables completely. The char isn't cosmetic — it's structural, adding bitterness to balance the natural sweetness underneath. Onions, when cooked slowly over indirect heat and finished with a quick sear, develop a depth of flavour that’s hard to achieve through any other method. The gentle infusion of thyme brings a subtle earthiness, lifting the dish without overpowering it.
This recipe relies on simple, seasonal ingredients – onions, fresh thyme, olive oil, salt, and black pepper – but the technique is what makes it stand out. Wrapping the onions in heavy-duty foil allows them to soften and caramelise evenly, while finishing them directly over the fire adds that essential smoky note and crisp texture. It’s a careful balance between patience and heat control, rewarding you with a clean, rich taste that complements any BBQ spread.
Cooking this way respects the integrity of the ingredients and the fire itself. It’s not about flashy tricks or unnecessary complexity, but about understanding how to coax the best from humble produce using straightforward, time-honoured methods. The result is a side that feels rooted in the seasons and the soil, perfect for everyday BBQ that’s both thoughtful and satisfying.
Ingredients
outer skin removed
Health Notes
This recipe uses quality, whole ingredients cooked with minimal processing. The grilling method adds flavour without the need for heavy sauces or added fats, making it a relatively straightforward nutritional option.
Notes
Seasonal Variations
Nutrition (per serving, estimate)
400
kcal
28g
protein
6g
carbs
26g
fat
Values are estimates and vary with portion size and preparation.
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Prepare the Grill for Indirect Heat
Set up your Weber Master-Touch for indirect cooking. Light a full chimney of Weber briquettes and allow them to ash over completely. Distribute the lit briquettes evenly into two baskets or piles on opposite sides of the charcoal grate. The centre of the cooking grate should be clear. Place the cooking grate on and close the lid, adjusting the vents to achieve a stable internal temperature of 180°C.
Prepare the Onions
Using a sharp paring knife, trim the top and tail of each onion, but ensure the root end remains intact to hold the structure. Score a deep cross into the top of each onion, cutting about two-thirds of the way down, but again, leaving the base intact. This allows the heat and seasoning to penetrate.
Season and Wrap
Place each onion on a square of heavy-duty aluminium foil. Drizzle 1 tablespoon of olive oil over the top of each, ensuring some runs into the scored cross. Place a sprig of fresh thyme into the centre of the cross. Season generously with sea salt and black pepper. Bring the edges of the foil up and crimp them tightly to form a sealed parcel around each onion.
Fire-Roast
Place the foil-wrapped onions directly onto the centre of the cooking grate, over the clear, indirect heat zone. Close the lid. Maintain the grill temperature at 180°C for 45 to 60 minutes.
Check for Doneness
After 45 minutes, carefully open one of the foil parcels. The onion should be completely soft and yielding when gently squeezed with tongs, and the outer layers should be deeply caramelised. If there is any resistance, re-wrap and continue cooking for another 10-15 minutes.
Serve
Remove the onions from the grill and allow them to rest in the foil for 5 minutes. Carefully unwrap, discard the thyme sprig, and serve immediately. The resulting liquid in the foil can be poured over the onion as a simple sauce.
Serve
Remove the onions from the grill and allow them to rest in the foil for 5 minutes. Carefully unwrap, discard the thyme sprig, and serve immediately. The resulting liquid in the foil can be poured over the onion as a simple sauce.
Health Notes
This recipe uses quality, whole ingredients cooked with minimal processing. The grilling method adds flavour without the need for heavy sauces or added fats, making it a relatively straightforward nutritional option.
Per serving (estimate)
400
kcal
28g
protein
6g
carbs
26g
fat
A chef's knife is the cornerstone of any BBQ or kitchen setup, especially when working with fresh, seasonal ingredients as Smoke & Soil champions. Its versatility means it handles everything from chopping vegetables to slicing meat with precision. A sharp blade is essential not only for efficiency but for safety: a blunt knife requires more force, increasing the risk of slips and accidents. Investing time in mastering your knife skills pays dividends in prep speed and consistency, allowing you to focus on the cooking and flavours rather than struggling with poor cuts. At Smoke & Soil, we believe in clean, whole-food cooking over fire. A quality chef's knife fits perfectly into this ethos by enabling you to work with integrity and respect for your ingredients. When you can slice through produce and protein cleanly, you preserve texture and flavour. The right knife also encourages mindful cooking: taking the time to prep properly means better results on the BBQ and a more enjoyable experience overall. Practical use advice is simple but crucial. Always pinch the blade where it meets the handle for maximum control and comfort. Use a rocking motion with the tip of the blade as a pivot rather than lifting the knife fully off the board between cuts. This technique improves speed and reduces strain. Avoid shortcuts like throwing the knife in the dishwasher or neglecting sharpening. Regular honing and occasional sharpening keep the blade in top condition, making your work safer and more enjoyable every time you cook.
Written by
L Field