This makes really nice 3" 1.5 oz burges for barbeque at kids parties. The baked bean tin was a prototype, and the oak ring is the final model. Parafin oil BP can be obtained from veterinary suppliers for a food safe finish. On YouTube you may hear Americans referring to "mineral oil", and this is what they mean. Beeswax can be dissolved in hot parafin oil (e.g. over a bain Marie) to give more shine.