Gluten-Free Savoury Root Vegetable Crumble

Preparation Steps

1. Preheat your oven to 190°C (fan) and get out a medium-sized baking dish (roughly 20 x 28 cm). Set aside.

2. Prepare the root vegetables. Peel the carrots, sweet potato, parsnip, and swede. Cut them into small cubes of about 1.5 cm, keeping the pieces as uniform as possible to ensure even cooking. Smaller pieces also reduce cooking time and are easier on the digestive system.

3. Par-cook the vegetables in a pan. In a large frying pan, heat 2 tablespoons of olive oil over a medium heat. Add the chopped vegetables along with the cumin, thyme, and rosemary. Stir well to coat every piece. Cook over a medium heat for 10 to 12 minutes, stirring regularly, until the vegetables are just beginning to soften on the outside but are still slightly firm in the centre. This par-cooking ensures a tender, melt-in-the-mouth texture once out of the oven, without overcooking.

4. Add the garlic-infused oil and chives. Remove the pan from the heat and stir in the tablespoon of garlic-infused olive oil and the finely chopped chives. Mix gently. This trick delivers all the flavour of garlic without the fructans that can trigger bloating in people with IBS. Season with salt and pepper to taste.

5. Transfer the vegetables to the baking dish. Spread the par-cooked vegetables in an even layer across the dish. Press them down lightly to create a compact base that will hold the crumble topping well.

6. Make the gluten-free crumble. In a medium bowl, combine the certified gluten-free rolled oats, wholegrain rice flour, sunflower seeds, pumpkin seeds, and ground flaxseed. Add the grated Parmesan (or crumbled aged goat's cheese), a pinch of salt, and a pinch of black pepper. Pour in the 3 tablespoons of olive oil and rub everything together quickly with your fingertips — as you would for a shortcrust pastry — until the mixture forms a rough, slightly damp, crumbly texture that just holds together in small clumps. Olive oil works beautifully in place of butter here and also helps boost the absorption of the carotenoids in the vegetables.

7. Top the vegetables with the crumble. Scatter the crumble mixture evenly over the surface of the vegetables, keeping it light and textured as you go — do not press it down. It is precisely this airy, uneven layer that creates the characteristic crunch. Make sure to cover the edges well to prevent the vegetables from drying out during baking.

8. Bake for 22 to 25 minutes. Place the dish in the centre of the oven and cook until the crumble is golden and lightly crisp. Keep an eye on the colour from the 20-minute mark — a warm golden hue is all you are looking for. Avoid overbaking, which will dry the crumble out and diminish the flavour of the dish.

9. Leave to rest for 5 minutes before serving. This resting time allows the vegetables to settle and the crumble to firm up slightly. Scatter over a few extra snipped chives to finish, if you like.

💡 Gut-Friendly Tips & Adaptations

Strictly low-FODMAP version: Replace the parsnip with extra carrots or swede, which are better tolerated in standard portions. Limit sweet potato to 75g per serving to stay within low-FODMAP thresholds. Always check that your oats carry a certified gluten-free label on the packaging.

If you are sensitive to lactose: Aged Parmesan is naturally very low in lactose and is generally well tolerated. You can also replace it with nutritional yeast (2 tablespoons) for a dairy-free alternative that delivers a similar umami depth.

To boost your fibre intake further: Stir an extra tablespoon of ground flaxseed directly into the vegetables before baking. The soluble fibre in flaxseed supports the production of short-chain fatty acids by your gut microbiome.

Storage: This crumble will keep for 2 days in the fridge in an airtight container. To reheat, place in the oven at 160°C for 10 minutes to restore the crunch — avoid the microwave, which will soften the topping.