Thinly slice the beetroots & potatoes. You want each slice to be around 4-5ml thick. You also want them all to be roughly the same size, so cut any huge pieces in half so that there is a flat edge.
Slick the onion into thin slices.
Slick the olive oil over a casserole dish
Layer the slices of beetroot and potatoes, I like how it looks with them all standing up in stripy circles or rows if the dish is square.
Once the beetroot and potatoes are layered, slip the onion slices in randomly around the dish, tucking them down between the slices of potato and beetroot.
Mix the thyme leaves, stock powder, white wine and water together, and add a little salt & pepper.
Pour the stock mix over the layered beets & potatoes.
Tuck the bay leaves in and around here and there.
Squish a bit of foil over the lot as a sort of 'lid' to help keep the steam in & accellerate the cooking process.
Pop in a moderate oven (Gas mark 7, 220C) for 40- 45 mins.
Then, check to see if the potatoes are tender ( no one wants potatoes that bite back!)
If they are not quite done, put back in the oven for 10 mins.
Then, take the foil lid off, and put back in the oven to crisp up the top and create that baked potatoey crispness that is just so delicious. 15 - 20 mins should do it.
Serve as a glorious side dish, or as a beautiful main event with some tasty accompanying sides.
Notes
Beware! This is super hot when it comes out of the oven. Leave it to 'rest' for 10 mins, the flavours will develop and you won't burn your mouth. This is also brilliant as left overs. It becomes even more squidgily delicious.