Here's the Ocado recipe, c+p as links do often expire:
Celeriac and Swede Rumbledethumps
Serves 4
Ingredients
- 600g celeriac, cut into 2-3cm dice
- 600g swede, cut into 1-2cm dice
- 45g salted butter, plus 1 tsp
- 1 nutmeg, for grating
- ½ medium onion, diced
- 200g curly kale, roughly chopped
- 100g mature cheddar, grated
- 1 mixed leaf salad (optional)
Method
Step 1 Cook the celeriac and swede in a large pan of boiling, salted water for 15-20 mins, until tender. Preheat the oven to 220°C/200°C fan/gas 7.
Step 2 Drain the veg, then roughly mash with 45g butter for a chunky texture. Season with salt, freshly ground black pepper and nutmeg, to taste.
Step 3 Melt the remaining 1 tsp butter in a large frying pan over a medium heat. Cook the onion for 4-5 mins until softened, then add the kale and cook for 5 mins more, adding a splash of water to generate steam. Stir through the mashed roots until combined.
Step 4 Decant the mixture into a deep 26 cm ovenproof dish and scatter over the cheese. Bake for 15-20 mins, until bubbling and golden. Serve with a dressed leafy salad, if liked.