Hey guys. So I came across this adorable tutorial on Tumblr to make little beer tankards

Cute right?

But the first picture in the post has me puzzled. It seems they used normal drinking glasses to bake the cakes in.

I didn't think that was possibly since untempered glass would know, ker-crack in the oven.

What's going on here? Can you lovely people help me out?

Some glasses will work, others may shatter. Does the tutorial explain that not all drinking glasses can go into the oven?

They might be jelly jars for canning.  It looks like it may have threads on the top ring for the cap attachment of canning lid and rings. Not sure.

@MimiFix I'm afraid it was purely a photographic post. Not a word on it.

I could always just bake a regular cake and cut the 'mugs' out :)

I agree with hobbist, they look like mason jars.

They do like like canning jars which would definitely work. Some drinking glasses may also work, as well as handmade ceramic pottery. I use pottery (mugs and drinking glasses) for baking little pies so those would also hold/bake cake batter.

I havent seen those sorts of jars for sale in my local town, but I have looked briefly online for them.

As for the drinking glasses technique, is there a way of telling if they are ovenproof (the reciepe I use is Gas 4/5) besides test running them in the oven? I'd be inclinced to get some new ones from the low end stores since well, I don't have a job. :/

and would regular everyday mugs work without shattering? 

Am assuming the insides are well greased with butter to get the cake out?

If they are oven proof sometimes it is printed on the bottom of the glass.

I can't imagine trying to get cake out of a mason jar.  I would either cut them from a sheet cake using a circle cutter, or maybe try baking them in something like a vegetable / soup can.  The end result is very cute!

Thank you for all the advice :)

If anyone's curious, the full tutorial is here

http://thefergiefergs.tumblr.com/post/82106379645/recipe-x

They are baked in wide mouth mason jars.  I make cake and quick breads like banana and lemon poppy seed in them every year for Christmas presents.