I am a waiter at a coffee shop and quite often I have guests that order cappuccino. As you knew, the milk foam of cappuccino looks very unstable and tends to overflow. Not to mention I have to bring the cappuccino from the barista on the first floor to guest on the second floor. Sometimes it does overflow. I want to ask how I can solve that problem with tools available in any coffee shops ?
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Two suggestions, one practical, the other probably less so.
1) Hold the cup directly, instead of the plate the cup is on. I don't know if that's allowed by health code or restaurant policy, but if it is, you get much more stability from cupping the cup in your hand than balancing it on a small plate. If you're already doing that: practice will get you there.
2) A good cappuccino should be fairly stable. I know there's disagreement about the proper way of layering cappuccinos, but the best ones integrate very finely textured foam into the milk, instead of just layering coffee - milk - foam on top of each other. Milk foamed this way is more stable than regular milk; I've carried cups filled to the brim up the stairs without any spilling. But: this is a barista-side issue, and to be honest, I wouldn't touch it ... the barista is going to make the cappuccino how s/he feels it's best, and being told to do something differently won't go over well.
Train yourself, again and again.
You need to train yourself into pouring the appropriate quantity of coffee and milk in the cup to allow enough foam to create a nice "cap".
(YMMV) The coffee/milk should be about 1/3 of the cup capacity, and the rest if filled with the milk foam.
After that, train yourself in bringing the cup to the customers, try with cups filled with water (less of a mess).
I find that moving/walking slowly tends to spill more than if you move faster; for me I shake less.
Cappuccinos are complex. They aren't overly difficult to make if you are a trained barista - it's just that there is a lot of variation on how to make them.
The two main ways to make a cappuccino:
With method #2, one lets the steamed milk settle into it's layers. (Note that when making milk with this method, more milk must be used and a wetter foam is required) Then, one holds back the foam and milk with a spoon at the spout and very slowly pours off at least half of the bottom layer of watery, blue-tinged milk. The next step is to stir what is left in the pitcher and pour it (continue swirling up until pour for best mix) into the espresso. You get something looking a bit more like this (ignore the art):
This method results in more of a uniform brown color as all the foam is mixing with the espresso.
Differences between the two:
How to solve your problem:
So I have given you a lot of information on cappuccinos - which you probably didn't need. The reason I did this is because if your cappuccinos are spilling that easily, the fault lies with your barista.
Your barista is most likely making cappuccinos using Method 1. He/She should adjust the size of the cap over the rim depending on the size of the cappuccino and the foam preference.
If a cappuccino is made with dry foam, you can make a higher cap. It is less likely to spill and the foam will start to dissipate after about a minute, bringing the the cap down (ergo, by the time you get it to the customer, they will still have an aesthetically pleasing cap on the drink).
If a cappuccino is made with wet foam, the cap should not be so high. It is more likely to spill. It doesn't need to be very high anyway as it will not dissipate very much between the barista and the customer.
If your barista is making cappuccinos using method 2 and is pouring enough in to make a cap, your barista should stop this. It isn't aesthetically pleasing and will spill.
As far a tool to prevent spillage, take a spoon and remove some of the foam on top. This is the only way to bring down the level so that it won't spill.
Other than that, evaluate your carrying technique. You may ask some other servers for tricks that they use.
(1): The cap is what is used to refer to the foam that forms a dome shape above the rim of the mug.
(2): Steaming/Frothing/Foaming milk usually all refer to the same process.
(3): Stretching refers to how much volume is added to the milk during the steaming process by allowing more/less air to be incorporated into the milk.