Nigella seeds are tiny black seeds that have an original taste and are used as a spice for many dishes. Nigella seeds are used to flavor curries, pulses and roasted vegetables. They are a very good flavor enhancer. For example, you can easily find them or need to use one of the substitutes in this curry. However, it's also excellent to just sprinkle nigella seeds on top of fresh tomatoes. You can do so for example with this irresistible and summery stuffed cherry tomatos.