Collect your fresh herbs. Here I am using Oregano but you can pretty much choose any herb. Chop it really finely.
Mash with butter and add a little lemon juice. You don't need much.
When it's all evenly mixed, roll it in greaseproof paper into a log shape and freeze it.
Store in the freezer and saw a bit off when you need to enliven your potatoes or veg.