Fermented foods bring tang, crunch and savoury depth to everyday meals. A spoonful of sauerkraut can brighten a baked potato, while miso can give a vegetable dressing a fuller flavour. You do not need a collection of jars or a special eating plan to enjoy them. Start with something that suits the food you already cook, then learn where its flavour works best.
This guide to fermented foods and how to use them focuses on their place in your kitchen: what fermentation means, which foods to try and how to turn a small purchase into several useful meals.
What makes a food fermented?
Fermentation involves microorganisms, such as bacteria or yeasts, changing components of a food. This develops flavours, aromas and textures. Milk becomes tangy yoghurt; cabbage can become sauerkraut; soya beans can become tempeh or form the basis of miso. These foods taste quite different, so there is no single fermented flavour to learn to like.
Fermented does not automatically mean that a food contains live microorganisms when you eat it. Baking sourdough bread, for example, changes that picture, as can heat treatment during manufacture. Nor are fermented and probiotic interchangeable terms. The NIH Office of Dietary Supplements explains that fermented foods do not necessarily contain probiotics with demonstrated health benefits.
Choose these foods for the meals they help you make, without expecting a particular effect on your digestion. They can sit alongside vegetables, fruit, beans and wholegrains as part of a varied diet.
Choose a starting point that fits your taste
Mild and creamy
Plain yoghurt is a familiar introduction, and milk kefir offers a drinkable, usually tangier option. Use either with oats, fruit or a savoury sauce. Kefir can be thinner than yoghurt, so add it gradually when replacing yoghurt in a dressing. Choose a product you enjoy without needing to cover its flavour with lots of sweet additions.
Crunchy and sharp
Sauerkraut is fermented cabbage with a sharp flavour. Kimchi comes in many forms, often with vegetables, chilli and aromatic seasonings. Try a little beside eggs, rice or a sandwich filling. If you dislike heat, look for a mild variety or start with sauerkraut. Check ingredients carefully: some kimchi contains fish or shellfish ingredients.
Savoury ingredients for cooking
Miso is a fermented paste used as a seasoning, while tempeh is a firm fermented food commonly made from soya beans. Miso dissolves into dressings and sauces; tempeh can be sliced, browned and served as the main component of a meal. Neither needs to be eaten cold. Follow the tempeh packet’s preparation and cooking instructions.
Use flavour to decide where it belongs
Think about the job the ingredient will do. Sharp fermented vegetables work well beside rich or soft foods, such as mashed beans, eggs or roast squash. Creamy fermented dairy can soften spicy flavours. Miso brings a concentrated savoury note, so taste before adding other salty seasonings.
- With breakfast: spoon plain yoghurt over porridge, or serve a little sauerkraut beside scrambled eggs on toast.
- With lunch: tuck drained kimchi into a cheese toastie, or add sauerkraut to a lentil and grated carrot sandwich.
- With dinner: serve browned tempeh with noodles and vegetables, or stir a little miso into a sauce for roast aubergine.
- As a finishing touch: add fermented vegetables to a bean bowl just before serving, keeping their crunch distinct.
Add juicy fermented vegetables at the last moment when making sandwiches, and drain them first to avoid soggy bread. Keep a crunchy topping separate from a packed meal until you are ready to eat.
Two simple ways to use a new purchase
Miso and lemon dressing for two
This makes enough to dress two bowls of cooked grains and vegetables. Start with the smaller amount of water, then adjust the consistency to suit your meal.
- 1 teaspoon miso paste
- 1 tablespoon lemon juice
- 1 tablespoon olive oil
- 1–2 tablespoons water
- Black pepper, to taste
- Put the miso and lemon juice in a small bowl. Mash and stir until the paste loosens.
- Whisk in the olive oil and 1 tablespoon of water. Add more water gradually for a thinner dressing.
- Taste with a piece of the food you are dressing, then add black pepper if wanted. Spoon over warm grains, steamed greens and cooked beans.
For a variation, replace the lemon juice with rice vinegar, adding it gradually to taste. Make the dressing just before serving, or refrigerate it in a covered container and use within two days. Stir again before using.
Baked potatoes with beans and sauerkraut
For two people, use two medium baking potatoes, one drained 400g tin of cannellini beans, two tablespoons of plain yoghurt, two to four tablespoons of drained sauerkraut and a small handful of chopped chives.
- Heat the oven to 200°C, or 180°C fan. Scrub and prick the potatoes, then bake for about an hour, until a knife slides easily into the centres. Larger potatoes may need longer.
- Warm the beans in a saucepan with a splash of water until steaming hot throughout. Roughly mash some for a softer filling.
- Split the potatoes and divide the beans between them. Add yoghurt, sauerkraut and chives, tasting before adding any salt.
Serve with cooked greens or a tomato and cucumber salad. Swap cannellini beans for butter beans, or use a suitable plain plant-based yoghurt alternative. Add cold toppings only to portions you will eat immediately. Cool unused cooked components promptly, refrigerate within two hours and use within two days, reheating until steaming hot throughout.
Shop and store with care
Buy a small pack first and plan two uses before opening it. Fermented vegetables and miso can contain plenty of salt, so use them as seasonings and check the label when comparing products. Check for allergens such as milk, soya and wheat, too.
Do not assume that every vinegar pickle is fermented, or that every fermented product contains live cultures. Read the product description and storage instructions rather than relying on its position in the shop. You can still enjoy a heat-treated fermented food for its flavour.
Follow refrigeration and after-opening instructions, using a clean utensil each time. The Food Standards Agency recommends keeping chilled food between 0°C and 5°C. Fermentation does not make a product exempt from its use-by date. Discard food with unexpected mould or other signs of spoilage; do not taste it to check whether it is safe.
Build familiarity at your own pace
Begin with a small amount alongside a familiar meal and see whether you enjoy it. There is no need to eat several fermented foods each day or force yourself to finish something you dislike. A gentler variety, a different texture or a smaller serving may be more appealing.
If you have a specific health condition or ongoing digestive symptoms, ask your GP or a registered dietitian for individual advice. For everyday cooking, keep the aim practical: one useful ingredient, a couple of meals you like and enough curiosity to try another combination when you are ready.
