Cooking With Rosemary: Timing, Prep, Amounts and the Dishes It Suits

Rosemary is a strong, resinous Mediterranean herb that stands up to heat. That makes it one of the easier herbs to cook with, and one of the easier ones to overdo: use too much and the flavor can be “extremely objectionable,” in the words of Delaware Extension.¹ It dries well, it’s at home with lamb, roast potatoes, focaccia and paella, and the thing to watch in a hot oven is burning. America’s Test Kitchen’s focaccia buries tufts of it in the dough for exactly that reason. For the plant and its chemistry, see rosemary.

At a glance

When to add rosemary

America’s Test Kitchen counts rosemary as a hearty herb to add early, because the volatile flavor compounds in hearty herbs are somewhat more heat-stable than those in delicate ones.² Other extension guides put it in later:

Those are general herb rules, not rosemary tests. In practice, a whole sprig in a braise from the start gives a rounded background note and lifts right out, while chopped leaves stirred in near the end taste sharper. The Visit València paella recipe adds a sprig of rosemary and lets it cook for about 5 minutes.⁶

Fresh vs. dried

Rosemary dries well. In America’s Test Kitchen’s tests across 24 recipes, dried oregano, rosemary, sage and thyme held up reasonably well in dishes that cooked for more than 20 minutes with a good amount of liquid, though tasters still liked fresh better in nearly every case.³ Another ATK guide says bay leaf, thyme, oregano, rosemary, marjoram and sage work just fine dried in moist dishes.⁷

Ratio (Computed): ATK found 1 part dried herb to 3 parts fresh gave the closest match in strength.³ So 1 teaspoon of dried rosemary replaces about 1 tablespoon of fresh. Since dried is stronger by volume, you’re at least as likely to overdo it with dried as with fresh. See dried rosemary vs. fresh.

You’ll hear that dried rosemary turns a dish bitter or overpowering if it cooks too long. We found no test showing that, and ATK’s results point the other way for long-cooked, liquid dishes.³ Burning is another story. ATK’s focaccia recipe buries tufts of rosemary in the dough specifically to keep them from burning in the oven.⁸ Rosemary sprinkled across a hot roasting tray is just as exposed.

Preparing rosemary

• Stripping. Hold the top of the sprig and pull your fingers down the stem, against the way the needles grow. They come right off.
• Chopping. The needles stay firm even after cooking, so mince them fine for anything you eat as is, like a rub, dressing or bread.
• Whole sprigs. The stems are woody. Use them to infuse a braise, a pan of potatoes or a pot of beans, then pull them out before serving.
• Dried. Crush dried rosemary before you use it. Taste of Home’s roasted rosemary sweet potatoes call for the dried herb crushed,⁹ and the University of Illinois Extension’s herb potato soup toasts crumbled dried rosemary and thyme in a dry skillet until fragrant.¹⁰

How much

The University of Delaware’s extension guide puts rosemary with bay leaf and sage in its group of strong herbs, and warns that the flavor can be extremely objectionable if you use too much.¹ Here’s the scale named recipes work at:

Went overboard? See too much rosemary.

Dishes and pairings

• Lamb. Saveur’s Roman lamb leg gets studded all over with garlic and fresh rosemary before roasting.¹¹ See spices for lamb.
• Bread. In ATK’s focaccia, Andrew Janjigian presses tufts of rosemary deep into the dough before the final rise, a technique the recipe credits to Nancy Silverton.⁸
• Paella. The Valencian recipe includes a rosemary sprig among its few seasonings. See paella spices for the full list.
• Potatoes and soups. Rosemary seasons both the Illinois Extension potato soup and the Taste of Home sweet potatoes above.
• Blends. Rosemary is 26% of the Label Rouge herbes de Provence blend, with savory, oregano and thyme,¹² and it’s in McCormick’s poultry seasoning with thyme, sage, marjoram, black pepper and nutmeg.¹³ See herbes de Provence and poultry seasoning.

Some say rosemary suits goat in particular. We found no named recipe for that, though the lamb logic would carry over. Beyond the blends and recipes above, garlic, lemon, olive oil, thyme and sage are the classic partners. Comparisons: rosemary vs. thyme, rosemary vs. sage and rosemary vs. lavender.

Keeping rosemary

Fresh, in the refrigerator. ATK says hearty herbs take in moisture through their leaves, so keep them dry, in their original packaging or an open zipper-lock bag in the fridge.² How long sprigs last depends on who’s counting:

You’ll see “three weeks in the fridge” quoted a lot for home rosemary. The closest sourced number is UC Davis’s, and that’s for commercial storage just above freezing. See how to store rosemary.

Freezing. Penn State Extension says you can freeze rosemary on the stem and use it frozen in the same proportion as fresh.¹⁶ South Dakota State University Extension says herbs are good for up to six months frozen.¹⁷ See can you freeze rosemary?

Dried. NCHFP says to keep dried herbs in airtight containers somewhere cool, dry and dark.¹⁸ See how to dry rosemary.

Rosemary oil. Herbs in oil can carry Clostridium botulinum, so Oregon State University Extension says homemade herb oil has to be refrigerated and used within 4 days, or frozen.⁴ Never keep it at room temperature.

Rosemary vinegar. Colorado State University Extension lists rosemary among the herbs for flavored vinegar. Its method calls for 3 to 4 sprigs per pint, vinegar heated to just below boiling, and sterilized containers. The vinegar keeps up to three months in a cool, dark place or six to eight months in the fridge. Throw it out at any sign of mold or fermentation.¹⁹

If you have none

Dried rosemary is the best stand-in for fresh, at a third of the volume. Thyme and sage can cover some of its role. See rosemary substitutes, tarragon vs. rosemary and rosemary uses.