Not sure about that, Tilly? They're very sour, so you'd need a lot of sugar!
Just weighed my windfall apples and I've got 17lb 10oz! After I've removed the bad bits, that weight will obviously fall, but it's not too bad since I got them for free, just foraging under the tree up at the local reservoir. There's a few russets on a small tree in my garden, so I'm hoping to mix all the apples together and have a go at making proper cider, which I've never done before. I hate cider, but my sister is now wheat intolerant and loves cider, so she should be able to drink it if it's just pure juice.