Yes, you can grind roasted herbs for herbal teas. Grinding increases the surface area, allowing for a more potent and flavorful infusion.
Grinding roasted herbs before using them in herbal teas is a common practice to enhance the tea's flavor and aroma. Roasting herbs beforehand helps to dry them out, making them easier to grind and also intensifying their natural flavors. The grinding process breaks down the plant material, exposing more of the herb's essential oils and compounds to the hot water during steeping. This results in a stronger, more flavorful tea. You can use a variety of tools for grinding, such as a mortar and pestle, a spice grinder, or even a clean coffee grinder. The fineness of the grind can be adjusted based on your preference; a finer grind will generally result in a stronger tea, but it may also produce more sediment.
Avoid grinding herbs too far in advance of brewing your tea. The increased surface area exposed by grinding can lead to a faster loss of volatile oils and flavor compounds, diminishing the tea's potency if stored for extended periods. Grind only what you need for immediate use or store the ground herbs in an airtight container in a cool, dark place.