In the Australian bush in the 19th century people had to improvise. The Billy Can is a tin, with handles, usually used to carry water.

2 cups of SR flour
1/2 teaspoon of salt
2 teaspoons sugar
1 tablespoon butter
1 cups milk or water (enough to make a medium or soft dough)
1 teaspoon of bicarbonate soda

Rub the butter into the flour. Knead. Mould into a Christmassy shape - a wreath, or a star. Bake in hot oven (or in ashes if you are cooking it in a fire). Cook for 20 minutes until brown. Serve with butter and jam, honey or golden syrup.