Yes, you can roast spices in bulk and store them for later use, but it's best to roast them in smaller batches to maintain optimal freshness and aroma.
Roasting spices enhances their flavor and aroma by releasing essential oils. When roasting in bulk, ensure even heating by spreading the spices in a single layer on a baking sheet. Preheat your oven to a low temperature, around 200°F (93°C). Monitor the spices closely, stirring every few minutes, to prevent burning. The roasting time will vary depending on the spice, but generally, it takes about 5-15 minutes. You'll know they're ready when they become fragrant and slightly darker in color. Once roasted, let the spices cool completely before storing them in airtight containers away from light, heat, and moisture. While roasting in bulk saves time, remember that spices lose their potency over time, so it's best to roast only what you'll use within a few months.
To maximize the shelf life and flavor of your roasted spices, consider vacuum-sealing them in smaller portions. This minimizes exposure to air and moisture, preserving their quality for a longer period.