Yes a crock-pot type slow cooker works just as well and make sure you mix the cornflour in cold water first. Another alternative is arrowroot/tapioca flour which will thicken it up but remain clear, thickens at about 65C from memory. Wish I could find some more air-core stuff. It was an 'as seen on TV' product and seemed pretty gimicky, but I bought some with 2/3rd discount when they closed the local shop. Basically a big stainless steel flask that you heat like an ordinary pot, set the casserole up and take the whole lot away and still good and hot to eat hours later.
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