Root Vegetable and Wholegrain Mustard Gratin

Instructions

• 1Assemble the processor with the grey spindle and yellow reversible shredder, with the fine side up in the bowl and shred both cheeses. Remove and set aside.
• 2Carefully assemble the clean processor bowl with the grey spindle and green S-blade. Add the garlic and process until finely chopped, scraping down the side occasionally. Carefully remove the S-blade leaving the garlic in the bowl.
• 3Assemble the processor with the grey spindle and orange adjustable slicer set on 2 in the bowl and slice the onion. Remove and set aside.
• 4With the process still set up with the slicer set on 2, slice the celeriac and transfer to a large mixing bowl. Slice the pumpkin and then the potatoes and transfer to the mixing bowl. Mix the vegetables to distribute evenly.
• 5Melt the butter in a large frying pan over medium-high heat. Add the garlic and onion and mustard seeds and saute for 4 minutes, or until softened. Add 1½ cups (375ml) cream and thyme and bring to a boil. Reduce the heat and simmer for 2 minutes to infuse. Add the wholegrain mustard, salt and pepper and stir to combine.
• 6To preheat the oven, insert the wire rack into position 6. Set the oven to Bake, Convection, 165°C, Rotate Remind, for 1 hour 15 minutes and press Start. Meanwhile, continue to the next step.
• 7Pour the hot cream over the vegetables. Add the remaining ½ cup (125ml) cream and mix to coat. Place half the vegetables in a 28cm x 23cm ovenproof dish and flatten. Sprinkle over half the cheese and repeat with the remaining vegetables and cheese. Cover with foil.
• 8Once preheated, place in the oven and bake for 1 hour 15 minutes. When the Rotate Remind signals, remove the foil and continue baking until golden brown and the vegetables are tender when tested with the tip of a knife.
• 9Remove from the oven and allow to stand for 10 minutes before serving. Serve sprinkled with finely chopped parsley, if desired.