Preserve herbs in ice cube trays with olive oil. Freeze in trays and then bag in ziploc bag. Use when cooking by popping herb cube in pan. Herbs that freeze well are: rosemary, sage, thyme and oregano. Oil is infused with herbs.
How to Freeze Fresh Basil and Ideas for Using Frozen Basil
How to Freeze Fresh Basil, plus recipes for using frozen basil. (I freeze mine in ice cube trays, then, once frozen, remove from the trays and store in zip lock bags. It's easy to pop a cube into a recipe and they defrost really quick)
So clever: How to freeze fresh herbs. Consider freezing chopped fresh herbs in ice-cube trays. Drop a teaspoon or two of herbs into each cube and fill with water or chicken broth. Pop out the cubes to add to sauces or soups.
Herbs in frozen olive oil is one of my favorite ways to harvest. The herbs don't get dry, brown and brittle in the same way they do when they're frozen in water. They also retain their scent and flavor much more effectively!