Here's What You'll Get If You Order A 'Light And Sweet' Coffee At Dunkin' - Tasting Table
Briefly

When a drink is ordered with 'light ice,' that means less ice; here though, 'light' refers to a visual color descriptor of coffee made with a lot of cream.
Light and sweet = extra cream (makes the coffee light) and extra sugar (makes the coffee sweet). The standard is to do 1 extra than the regular amount.
Standard for a large is four [sugars and creams] ... Light and sweet is extra extra, which is six [sugars] and six [creams].
I've come to learn [that one extra] usually that isn't enough for people... I usually go three extra when someone says light and sweet.
Read at Tasting Table
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