I like the methodology. In fact, it might actually come down to pen and paper since it looks like we might open next week. I'll report more if it happens.
But, you wouldn't happen to have a copy of that paper you used to share with us, would you?
The piece of paper was blank!
I kept it that simple. Essentially the paper was filed for analysis later. I did start tracking through excel the info on it - ie what was ordered, total of order versus how much I actually charged etc.
I think the key is to work out what you want to know, what you may want to know, and what you don't care about.
Once you have that, work out the simplest way (in your mind to achieve it) and then look for that solution.
A POS system may be the answer, a simple programmable cash register may be better. A plain old piece of paper may just work.
What complicates things is if you are not going to be there all the time. (which is the case I suspect)
Terefore what you are analysing will include stock on hand versus sales etc.
You will want to know double vs single serve, or may not care.
It's all that information that you need. Could be a preprinted "order" form is the solution - something that has tick boxes, and a box for special instructions - essentially a printed menu.
But, if you work out what you want, and thesimplest way to work that data capture into the order / serve process, that will make finding a system easy.
At the moment you arae walking into a POS shop and saying "I want a POS" without knowing what POS is to you.
If you want to discuss specifcs offline, go for it. Theres a time zone issue, that may actually work for you if you want to skype me during my day - I am typing this at 5pm my time.
In the end the process really is one that you have to think through yourself - but throwing the question out is a good way of double checking...