Just an ounce. Fortunately, with spices, the risk is usually worth it. Ajwain plays a little like a greatest hits album of more common herbs and spices. It tastes unmistakably like thyme, but it's got some oregano-like pungency, a bite reminiscent of cumin, and an aftertaste that may remind you of anise. But ajwain is an assertive, distinct spice all its own.