Potato and Celeriac Gratin

A simple but tasty dish that can be prepared ahead of time and reheated. Serve with a roast meal or grill. I buy a large Celeriac and use it to make soup, salad and this Gratin. The recipe is from Epicurious and adapted for the TMX. This recipe makes 6 generous serves. It can be made any size , just keep the proportion of potato to celeriac , 2/3 potato to 1/3 celeriac.

2 large onions, peeled and 1/4
4 cloves of garlic, peeled.
400g. potato when peeled
200g. celeriac, when peeled
3 sprigs of fresh thyme
1 cup of grated Gruyere or tasty cheese.
salt and pepper. Olive oil
300g cream and 200g milk

Set oven to 200 o C

Drop onion and 2 cloves of garlic on to blades ,speed 7 until chopped.
Scrape down sides and add 1 Tablespoon of oil and cook on speed 2 / 100 o/5 mins. Set aside. No need to wash bowl.
Roughly chop potato and celeriac. Place potato into bowl first and then celeriac.
Zap on turbo until large chunks result.( I did this 3 times) There may be some uncut lumps but cut these with a knife as more processing will produce a pulp.

Layer 1/2 the mix into an oven proof baking dish, dot with 1/2 the onion and spread over with fork, sprinkle 1 sprig of thyme and generous salt and pepper, and 1/2 the cheese.
Repeat above layer.
Into washed TMX bowl, remaining 2 cloves of garlic zapped, cream and milk and 1 sprig of thyme. Heat to 80/speed 3/ 5 mis.
Strain this mix over dish.
Cover with foil and place on oven tray.
Bake for 30 mins, remove foil. Top up cream if there is not a thin coating over potato mix..
Return to oven and bake until light brown on top. 25/30 mins.