Robusta helps explain the caffeine reputation of many Vietnamese coffees:
ICO’s Coffee Development Report 2020 describes it as containing more caffeine than Arabica. The coffee dose and the amount of water used in a recipe also affect how concentrated a drink tastes. Compare the actual product, recipe and finished serving when deciding what “strong” means for your menu.
The
FDA’s caffeine overview notes that amounts vary by product and serving size. Ask for information about the specific coffee and the serving you intend to prepare.
For a brewing trial, follow the product or equipment instructions and record dose, grind, water, preparation time and finished volume. Keep the recipe and any available caffeine specification together, including the method and serving size behind a measured result.