Why Freeze Fresh Herbs?

A supermarket bunch of parsley or coriander rarely survives the week. You use a handful for one recipe, and the rest slowly turns to black mush at the back of the fridge. If you grow your own on a windowsill or in a few pots by the back door, the problem is the opposite — a late-summer glut you cannot possibly eat fast enough. Freezing solves both, and it does so without losing much of the flavour that makes fresh herbs worth having in the first place.

The ice cube tray method is the neatest trick in the home kitchen. Chop your herbs, pack them into the trays, cover with oil or water, and freeze. What you get is a tray of ready-measured portions that drop straight into a hot pan, a bubbling stew, or a pot of soup. No chopping, no waste, no sad slimy bag. The clever part is that the oil or water protects the leaves from freezer burn while keeping every bit of their scent and colour.

Which Herbs Freeze Well — and How to Treat Them

Almost all herbs freeze successfully, but they fall into two groups and each wants slightly different handling.

• Soft-leaved herbs — basil, parsley, coriander, dill, mint, chives, tarragon and chervil — are the ones to chop and freeze in trays. They lose their crispness once thawed, so treat them as a cooking ingredient rather than a garnish. A cube of frozen basil in a tomato sauce is every bit as good as a handful of fresh leaves stirred in at the end.
• Woody herbs — rosemary, thyme, sage, oregano and bay — hold their shape far better. Freeze them whole, either on the stalk or stripped, in a small labelled bag. You can crumble them straight into the pan while still frozen, and they will taste far brighter than the dried jars on the spice rack.

Whichever group you are dealing with, pick your herbs at their peak. Cut them mid-morning once the dew has dried but before the sun gets strong, as that is when the oils are at their most concentrated.

The Oil Method: Best for Basil, Rosemary and Sage

This is the version most cooks reach for, and it is ideal for any herb you would happily pair with olive oil.

• Rinse the herbs and dry them thoroughly. Any water left clinging to the leaves will turn into ice crystals and dilute the flavour. A clean tea towel or a salad spinner does the job.
• Strip the leaves from tough stalks and chop them reasonably finely. You do not need a perfect dice — a rough chop is fine.
• Pack the chopped herbs into the compartments of an ice cube tray, pressing them down gently. Fill each one loosely rather than cramming it solid.
• Pour oil over the top until it just covers the herbs. Olive oil suits basil, oregano and rosemary; a lighter rapeseed or sunflower oil is better for delicate herbs such as parsley or chervil.
• Freeze for four hours or overnight, then pop the cubes out and store them in a labelled freezer bag.

If you have a glut, blitz a large handful of herbs with enough oil to make a loose paste, then spoon that into the trays. It is quicker and gives a more even cube.

The Water Method: Neutral Cubes for Soups and Stews

Water works just as well as oil and has the advantage of being completely neutral. It is the better choice for mint, dill, coriander and chives, and for anything destined for a stock pot or a smoothie.

Prepare and chop the herbs exactly as above, pack them into the trays, then top up with cold water. For extra depth, you can use leftover stock instead of water, or even a splash of white wine for cubes destined for a fish dish or a risotto. Freeze and store in the same way.

A tray of mint in water is worth keeping on its own. Drop a cube into a jug of water with lemon, or into a mug with hot water and honey for a soothing tea.

Getting a Neat Finish: Practical Tips

The method is forgiving, but a few small habits make the whole process tidier and your frozen portions last longer.

• Use silicone trays if you have them — the cubes release with a single push. Rigid plastic trays work too; just dip the base briefly in warm water if the cubes resist.
• Stand floppy trays on a baking sheet before carrying them to the freezer, otherwise you will be mopping oil off the kitchen floor.
• Label everything with the herb name and the month. Frozen green cubes all look alike once they are bagged up together.
• Keep oil cubes for around three months and water cubes for up to six. Beyond that the flavour fades, and oil can begin to taste stale.
• For bigger portions, use a muffin tin lined with cling film, or freeze chopped herbs flat in a bag and snap off pieces as you need them.

Cooking With Your Frozen Herbs

There is no need to thaw them. Drop a cube straight into a hot pan and let it melt into whatever you are cooking. Oil cubes are brilliant at the start of a dish — melt one in the pan before adding onions, or toss a couple with chopped root vegetables before roasting. They also stir beautifully into a tomato sauce, a pasta dressing or a marinade.

Water cubes suit anything wet: soups, casseroles, curries, poaching liquid for fish, or the water you cook rice in. As a rough guide, one cube holds about a tablespoon of fresh herb, so a recipe calling for two tablespoons of chopped parsley wants two cubes.

A few pairings worth freezing in batches: basil and olive oil for pasta, mint and water for summer drinks, rosemary and rapeseed oil for roast potatoes, and coriander and water for curries. Once you have a row of trays in the freezer, you will wonder how you ever managed without them.