Has this happened to you [it has to me]: you've found the local popular market that meets the 'not too touristy' criterion that we want in our silly internal contest between tourist and traveler but now you feel a bit of an oaf rather than a sophisticated traveler because you can't clearly ask for what you want, holding up the flow for both seller and regular customers?
In a bar in Spain I know that 'tapa' is snack size and 'racion' is a full/large meal portion so learning the term 'media-racion' is a real win, as is the term 'la mitad' when you want a half-slice of something. Similarly with wine, if a bottle is too much and a glass too little, then hurray for a quarter liter or half liter.
What are the terms used in markets for picnic-size portions and amounts of the stuff you're buying to put together a picnic?
RS TV episodes show him ordering an 'etto' or 'etta' of cheese, for instance -- 100 grams is a decent Italian cheese sandwich, just under a 1/4 pound. But what if I'm not in Italy, or I'm not ordering cheese? I want us to share the right terms for the right amounts in markets where you like to travel in Europe. TIA.