‘Wine by the glass’ is not a new experience for New Zealand dinners - who have had this option offered for many years now. But around the rest of the world ‘wine by the glass’ programs have only grown in size and popularity across the more ‘casual dining’ outlets over the past 10 years or so.
A few things to be aware of: There is no standard glass pour size. A 175ml pour is a typical glass of wine in some countries, but for staff this can lead to unequal pours and a second bottle required to top up the last glass pour. However, many establishments in New Zealand prefer a 150ml pour as it allows them to serve/manage exactly five glasses of wine per bottle. Though this said - with a pouring line or logo on the glass, more control in pouring three or four pours from a bottle is becoming more common in some establishments.

 

If the wine is available by the glass, you can feel quite comfortable asking for a taste before committing to order a whole bottle.
A 750ml bottle contains enough wine for 4-5 full glasses of wine, a comfortable amount for a two-person dining occasion. The mark-up per glass varies considerably - across the world there is an extreme range in calculations as to what people charge for a glass pour. It is also very common for two restaurants to charge considerable different prices even when located across the street from each other - depending if it is 'casual dining' or a more 'formal fine dining' restaurant.
Remember an open bottle of wine can spoil quickly - most restaurants do not use wine preservation systems. The wines poured at the beginning of service are often open from the night or day before. On larger wine lists some wines can be open for multiple days. The wines that are left open the longest tend to be ordered the least: obscure brands, unknown styles or varietals, high-priced wines, sweet and fortified wines.
Occurring less each year - but still a detail to note, corporate brand placements - large wine brands pay money to partner with chain restaurants and hotel groups. These partnerships can on occasion limit the wine list and the wines by the glass at key price-points. This partnership can encourage staff to push a wine based on financial incentives rather than a good pairing with the menu or your meal. Well managed ‘wine-by-the-glass’ programs can increase sales turnover and with limited spoilage are more profitable than bottle sales. However, restaurants and bars typically only offer a limited range of lower value wines by the glass. This is because of the problems and risks associated with opening higher value premium wine labels, these being: Staff over-pouring glasses and thereby reducing profit margins - or wine that is not consumed oxidizing and being wasted. Though wine preservation systems like ‘Le Verre de Vin’ protect wine from oxidation enabling bottles to be opened and served over a period of 2-3 weeks.
The key to a successful wine by the glass selection is working with the menu - and when possible the chef, so you know how each dish will be cooked and served. The correct storage and temperature of open white and red wine bottles is always an issue with a large ‘wine by the glass’ program. For a restaurant owner - when selecting wines by the glass to match your menu - make sure that every dish on the menu has a wine match - (one wine can match with more than one dish). There are too many wines by the glass programs out there that only do it by price. Don’t get me wrong - glass price is a factor to always consider. It’s important to include some affordable and well known wine options, but you must select wines that are drinking now, well balanced and match your menu. With well educated staff - don’t be afraid to select wines from around the world.
Wines by the glass programs should not be an afterthought - as for many reasons today, bottle purchases are less - so having a good and well chosen wine by the glass selection - you can match a wine with an entrée, main and dessert and for all other occasions that your guests visit.
Don’t go too far; an overly large wine-by-the glass list isn’t always better because it’s a lot of work and more difficult to maintain, structure and keep track of tiring wines. But for me the key to a successful ‘wine by the glass’ program is well educated staff.