Each autumn with our surplus apple juice we simply strain it, bottle it and freeze to have apple juice for future consumption. This year with some of it we had a go at ‘pasteurising’ it. We simply filled glass bottles and put in the oven for 20 minutes at 80-100 degrees C. This has been stored in the garage. We’ve recently tried it and it is sweet, tasty and slightly fizzy. Any thoughts about what’s happened.