As a general rule, use 1 teaspoon of dried herbs for every 1 tablespoon of fresh herbs, since drying concentrates their flavor. These lemon-roasted potatoes show how to use that ratio in a simple side dish, with either fresh or dried rosemary and thyme.
Ingredients
- 2 lb Yukon Gold or red potatoes (900 g), scrubbed and cut into 1-inch (2.5 cm) pieces
- 2 tablespoons olive oil (30 ml)
- 1 tablespoon finely chopped fresh rosemary (about 3 g), or 1 teaspoon dried rosemary (5 ml; about 1 g)
- 1 tablespoon fresh thyme leaves (about 2 g), or 1 teaspoon dried thyme (5 ml; about 1 g)
- 3 garlic cloves (about 9 g), finely chopped
- ¾ teaspoon fine salt (4.5 g)
- ¼ teaspoon black pepper (about 0.5 g)
- 1 teaspoon finely grated lemon zest (about 2 g), optional
Instructions
- Heat the oven to 425°F (220°C). Line a large rimmed baking sheet with parchment for easier cleanup, or leave it unlined for slightly more browning. Cut the potatoes into pieces of similar size so they cook evenly.
- In a large bowl, mix the olive oil, rosemary, thyme, garlic, salt, pepper, and lemon zest, if using. If using dried herbs, rub them briefly between your fingers as you add them; this breaks up clumps and releases some aroma. Add the potatoes and toss until the pieces are evenly coated.
- Spread the potatoes on the baking sheet in one layer, leaving a little space between pieces. Roast for 20 minutes, then turn them with a spatula. Crowding traps steam, so use a second sheet if the potatoes are piled up.
- Roast for another 20 minutes, or until the potatoes are browned at the edges and tender when pierced with a knife. Very large pieces may need a few extra minutes; small pieces may finish sooner. Taste one carefully and add a pinch more salt if needed.
- Serve hot. If you have fresh rosemary or thyme, scatter a little over the potatoes just before serving for a brighter aroma. This finishing herb is optional and is not included in the measured amounts above.
How to Convert Fresh Herbs to Dried
The standard conversion is 1 part dried herb to 3 parts fresh herb by volume. In kitchen measures, that means 1 teaspoon dried for 1 tablespoon fresh, or 1 tablespoon dried for 3 tablespoons fresh. For example, if a soup recipe asks for 2 tablespoons of chopped fresh oregano, start with 2 teaspoons dried oregano. If it calls for ¼ cup chopped fresh parsley, use about 1 tablespoon plus 1 teaspoon dried parsley, though dried parsley will not provide the same fresh color or texture.
Measure fresh herbs after removing tough stems and chopping the leaves, unless a recipe says otherwise. Spoon dried herbs into the measuring spoon without packing them down. The ratio is a starting point, not a promise that every herb or dish will taste identical: varieties, age, storage, and personal preference all affect strength. For an unfamiliar brand or a herb you rarely use, add about two-thirds of the suggested dried amount first, then taste and add more if the dish needs it.
Dried herbs release flavor more slowly than fresh leaves. Add them early enough to simmer or roast with the food, rather than scattering them on at the end as if they were fresh. Fresh herbs are often best near the end of cooking, where their lively scent and color remain noticeable. That difference is why these potatoes are seasoned with dried herbs before roasting, while an optional fresh sprinkle goes on after baking.
Tips
- Use the ratio as a starting point. Dried herbs can be especially potent when recently opened, while an old jar may taste faint. Start slightly under the 3-to-1 conversion in delicate dishes, taste, and adjust. You can add more seasoning, but you cannot remove it once it is mixed in.
- Match the herb to the cooking time. Rosemary, thyme, oregano, and sage generally stand up well to roasting or simmering. Delicate herbs such as basil, dill, cilantro, chives, and parsley often lose their fresh character when cooked for a long time. Use dried versions during cooking if that is what you have, but consider adding fresh leaves at the end when available.
- Check whether the ingredient is leafy or a whole spice. The 3-to-1 rule is for chopped leafy herbs, not every herb product. A bay leaf is usually exchanged one for one—one dried leaf for one fresh leaf—because it is used whole and removed before serving. Do not crush a bay leaf into a dish as a direct volume substitute.
- Keep the texture in mind. Dried herbs season food but cannot replace the juicy, soft texture of fresh leaves in a salad, salsa, or herb sauce. If fresh herbs are central to the dish, choose another fresh herb with a similar flavor or make a cooked version that can use dried seasoning.
Serving Suggestions
Serve the potatoes hot alongside roasted vegetables, grilled tofu, beans, or a main dish of your choice. Their lemon, garlic, rosemary, and thyme flavors also work with a simple green salad or steamed greens. For a meal with several seasoned components, keep the other dishes lightly seasoned at first, then taste everything together before adding more salt or herbs.
For a casual table, transfer the potatoes to a warm serving bowl and finish with lemon zest or a small handful of chopped parsley if you have it. A spoonful of plain yogurt or a mustard vinaigrette can be offered alongside for dipping. The fresh garnish is optional: the dried-herb version is already seasoned, so there is no need to buy fresh herbs just to finish the dish.
Variations
Use a different herb: Substitute dried oregano for the thyme, using 1 teaspoon dried in place of the tablespoon of fresh thyme. Marjoram also works; its flavor is softer and a little sweeter. For a more savory, earthy profile, use sage, but begin with ½ teaspoon dried because its flavor can dominate a small batch.
Make it paprika-garlic style: Replace the rosemary and thyme with 1 teaspoon smoked paprika (5 ml; about 2 g) and ½ teaspoon ground cumin (2.5 ml; about 1 g). These are spices rather than dried herbs, so the fresh-to-dried herb ratio does not apply. The result is warmer and smokier, with less of the piney flavor of rosemary.
Add fresh herbs after roasting: If you have fresh parsley, chives, or dill, chop 1 to 2 tablespoons (15 to 30 ml) and toss them with the cooked potatoes just before serving. This gives a fresh finish without risking scorched leaves. You can still use the dried rosemary and thyme in the roasting oil.
Change the vegetables: The same oil-and-herb mixture can season carrots or parsnips cut into similar-sized pieces. Their cooking time may differ from potatoes, so check tenderness early rather than assuming they need the full 40 minutes. A mixed tray can cook unevenly if the vegetables are cut to very different sizes.
Storage and Reheating
Refrigerate leftover potatoes within 2 hours of cooking in a covered, shallow container. They keep for 3 to 4 days in the refrigerator. The herbs may taste less vivid after storage, but the potatoes remain useful in breakfast hash, a warm grain bowl, or a quick skillet meal. Do not leave cooked potatoes at room temperature for extended storage.
For the best texture, reheat them in a single layer on a baking sheet at 400°F (200°C) for about 10 to 15 minutes, turning once, until hot throughout. Reheat leftovers to 165°F (74°C), the USDA FSIS safe temperature. A skillet over medium heat also works; stir occasionally and heat until steaming hot throughout. The microwave is convenient but tends to soften the browned edges.
You can freeze the cooked potatoes in a freezer-safe container for about 1 to 2 months for best quality, though freezing may make their centers softer after thawing. Cool and refrigerate them promptly before freezing, and thaw overnight in the refrigerator if convenient. Reheat from thawed or frozen until the center reaches 165°F (74°C).
Frequently Asked Questions
What is the basic dried-to-fresh herb ratio?
Use 1 teaspoon dried herb for every 1 tablespoon chopped fresh herb. That is a 1-to-3 ratio by volume. It works well for many leafy herbs in cooked recipes, but taste and adjust because dried herbs vary in strength and some herbs change more noticeably during cooking.
Can I substitute dried herbs for fresh herbs in every recipe?
Not always. Dried herbs can season soups, sauces, roasted foods, and braises, but they do not reproduce the texture or bright flavor of fresh herbs in salads, uncooked sauces, or garnishes. In those dishes, use another fresh herb if possible, or choose a preparation where dried herbs can be cooked into the food.
Should dried herbs go in at the beginning or the end?
For most cooked dishes, add dried herbs early enough for their flavor to soften and spread through the food. Add fresh, delicate herbs near the end or after cooking to preserve their color and aroma. In a long-simmered dish, taste before serving and add a small amount more if the dried herb flavor has faded.
Do I need to crush dried herbs before measuring?
No special grinding is needed. Rub leafy dried herbs gently between your fingers as you add them to release aroma and break up larger pieces. Measure first, then rub them over the pot or bowl; crushing them before measuring can change how much fits in the spoon.
How can I tell whether dried herbs are too old to use?
Rub a small pinch between your fingers and smell it. If the aroma is faint, dusty, or hard to identify, the herb may have lost much of its flavor, even if it is still safe and dry. Replace it or use a little more, tasting as you go. Store herbs tightly closed away from heat, light, and moisture.
Does the 3-to-1 ratio work for bay leaves?
No. Bay leaves are generally substituted leaf for leaf: use one dried bay leaf for one fresh bay leaf. Both are usually simmered whole and removed before serving, so the leafy-herb volume ratio is not a useful comparison. If a recipe calls for a crumbled or ground bay leaf, follow its specific amount rather than this general conversion.
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