stem ginger 
noun [mass noun]
A superior grade of crystallized or preserved ginger.The other featured flavor in this cheesecake is stem ginger, which is rarely, if at all, found in Japan....
- Bring the caster sugar and 500 ml of water to the boil in a medium saucepan, then add the lemon juice, stem ginger, star anise and the vanilla pod.
- It's like a vicarious revenge coated in chocolate and nuggets of stem ginger.