The flavour comes from three components working together. Ginger extract provides a gentle spicy warmth, not a sharp burn; lemon juice extract adds a bright citrus note; and black tea extract gives a fuller tea background. Because the tea is sweetened, the overall impression is a warming, lively drink rather than a plain black tea or a purely sour lemon drink.
How strong the ginger or sweetness feels depends on how much water you use. A smaller amount of water makes the ginger and lemon more concentrated, while a larger mug softens both the spice and the sweetness. If you are sensitive to ginger, citrus or sweet drinks, start with a milder preparation by using more water, or take a small sip before deciding whether to add more water. You can also let the tea cool slightly, as very hot liquid can make the ginger warmth feel stronger.
This tea is not intended to replace fresh ginger or lemon in cooking, and it does not have the same intensity as a freshly brewed ginger infusion. It is best understood as a convenient flavoured instant tea with a balanced taste. If you prefer less sweetness, you cannot remove the sugar already in the sachet, so the practical option is to dilute it with more hot water. If you prefer a more pronounced tea character, you could brew a small amount of plain black tea and use it as part of the liquid, but this is optional and changes the intended flavour balance.
As with any sweetened beverage, it is sensible to consider how it fits into your overall daily sugar intake. The packaging lists the full composition, so check it if you are monitoring sugar or other ingredients.