Aldi's Sugar Free Hazelnut Creamer, often sold under their Barissimo brand, is a liquid coffee creamer designed to add a hazelnut flavor to your coffee without the added sugar. Here's a general description based on available information: 

Taste and Aroma: It offers a sweet hazelnut flavor. Some reviews suggest it might have a slightly artificial aftertaste, which is common in sugar-free products due to the artificial sweeteners used. The aroma is typically that of sweet, roasted hazelnuts.

Sweetener: Being sugar-free, it uses artificial sweeteners like sucralose and acesulfame potassium to provide sweetness without the calories and sugar of regular creamers.