Roast potatoes with rosemary and thyme salt

Name: Roast potatoes with rosemary and thyme salt
Prep time: 10 min
Cook time: 1 h 20 min
Total time: 1 h 30 min
Ingredients: 1 kg Potatoes, red skin variety; 1 tsp Salt; 1 tsp Bicarbonate of soda; Cold Water; 100 g Goose fat or duck fat; 10 g Sea salt; 7 g Fresh rosemary, leaves picked; 5 g Fresh thyme, leaves picked

By Tom · Updated 17 August 2026

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About 1 hour 30 min
Takes a bit of care

Whether you're cooking for a family dinner, a Christmas feast, or just craving the perfect potato side dish, the crispiest, fluffiest roasties you've ever tasted.

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The recipe

Roast potatoes with rosemary and thyme salt

Whether you're cooking for a family dinner, a Christmas feast, or just craving the perfect potato side dish, the crispiest.

10 min prep
1 hour 20 min cooking
Takes a bit of care

Times and difficulty are our estimates from the method, not stopwatch figures.

Quantities

Measurements

Ingredients

Rosemary & thyme sea salt

10 g Sea salt
7 g Fresh rosemary, leaves picked
5 g Fresh thyme, leaves picked

Tick things off as you go — they stay ticked if you close the page.

A dotted underline means the amount has been rounded to something you can measure.

Method

Step 1
Peel the potatoes (1 kg) and cut them into equal-sized pieces. I recommend cutting them in half or quarters but try to make them all a similar size.
Step 2
Place the potatoes (1 kg) in a saucepan, add the salt (1 tsp) and bicarbonate, and top it up with cold water until the potatoes are covered. Place over high heat and bring to a boil. Once boiling, turn it down to low and simmer for 20 to 25 minutes until the potatoes are completely cooked through.
Step 3
Gently remove them from the water and place them onto a cooling rack.
Step 4
Place the goose/duck (100 g) fat onto a baking tray and into a preheated oven at 180°C Fan for 10 minutes. Once hot, place the potatoes (1 kg) into the fat and roll them around. Place back into the oven for a total cooking time of 45 minutes, turning them around every 15 minutes - two turns in total.
Step 5
To make the Rosemary (7 g) and Thyme (5 g) Sea Salt (10 g). Add the ingredients into a mortar and pestle and grind them together until the herbs break down and you have a bright green fine sea salt mixture.
Step 6
Remove the potatoes (1 kg) from the oven and season them with the rosemary (7 g) and thyme (5 g) salt (1 tsp).

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Also in Christmas dinner, start to finish, The Sunday roast.

Questions people ask

How long does roast potatoes with rosemary and thyme salt take?

About 1 hour 30 min from start to finish, of which 10 min is prep and 1 hour 20 min is cooking. That figure is worked out from the method rather than timed with a stopwatch, so give yourself a little more the first time.

How much does this make?

The original recipe did not state a yield, so nothing has been invented for it. The scale control on the recipe card multiplies the quantities instead, which is the honest version of the same thing.

Can I see the ingredients in ounces and pints?

Yes. The metric and imperial switch on the recipe card converts every quantity, rounded to amounts you can actually weigh or measure rather than to four decimal places. Your choice is remembered for every recipe on the site.

Roast potatoes with rosemary and thyme salt