Baking a seaweed and oat bread

A coastal loaf with deep roots

There is something quietly satisfying about baking with the shore in mind. A seaweed and oat bread is not a novelty. It belongs to a long coastal tradition of using what the tide leaves behind: dulse dried on warm stones, kelp gathered after a storm, laverbread folded through warm porridge. Oats, too, have long been a staple of northern and western Britain, thriving in thin soils and salty air. Put the two together and you get a loaf with a deep, savoury note, a tender crumb and a crust that smells faintly of the sea.

This is a simple, yeast-free loaf, closer to a soda bread than a yeasted tin loaf. It comes together quickly, needs no proving and suits a kitchen where the kettle is always on. Serve it thickly sliced with a bowl of split pea soup, a wedge of sharp coastal cheese, or simply buttered while still warm.

Choosing and preparing your seaweed

For a dependable loaf, use food-grade dried seaweed. Dulse gives a rich, almost bacon-like savour, kelp adds depth and umami, and nori is milder and easier to find. Sea spaghetti has a pleasing nuttiness. Avoid fresh seaweed straight from the beach unless you are certain of its safety and local rules. Storm-cast seaweed can be gathered in some places, but never strip living plants from rocks, and always check byelaws and water quality.

Dried seaweed often arrives in sheets or flakes. If using sheets, toast them briefly in a dry pan over a low heat until they crisp, then crush them finely with your fingers or a pestle and mortar. You want about 15g of crushed seaweed for this recipe. A little goes a long way: too much and the loaf turns bitter and strangely fishy. If you are new to seaweed baking, start with 10g and increase next time.

The oat and seaweed loaf

This makes one 900g loaf. You will need a 900g loaf tin, lightly greased.

• 150g porridge oats, plus a handful for topping
• 250g wholemeal flour
• 100g plain flour
• 1 tsp bicarbonate of soda
• 1 tsp fine sea salt
• 10–15g dried seaweed, finely crushed
• 300–350ml buttermilk, or milk with 1 tbsp lemon juice
• 1 tbsp black treacle or honey, optional
• 25g butter, melted, or 2 tbsp olive oil

If you do not have buttermilk, stir the lemon juice into the milk and leave it for ten minutes. The acidity helps the bicarbonate of soda do its work, giving the loaf a gentle rise and a tender texture.

Mixing, shaping and baking

• Heat the oven to 200°C (180°C fan, gas 6). Grease the loaf tin.
• Put the oats in a large bowl, pour over the buttermilk and leave to soak for 10 minutes.
• In another bowl, mix the wholemeal flour, plain flour, bicarbonate of soda, salt and crushed seaweed.
• Add the treacle or honey, if using, and the melted butter or oil to the soaked oats.
• Tip the dry ingredients into the wet and mix with a wooden spoon until a soft, sticky dough forms. Add a splash more milk if it feels stiff, or a spoonful of flour if it is too wet.
• Scrape the dough into the tin. Smooth the top with a wet spoon. Sprinkle over the extra oats and a pinch of crushed seaweed.
• Bake for 40–45 minutes, until risen, deep brown and hollow-sounding when tapped underneath.
• Turn out onto a wire rack. Wrap in a clean tea towel while still warm if you like a softer crust. Cool completely before slicing, though it is very hard to wait.

At the table

This loaf is at its best on the day it is baked. The seaweed flavour settles overnight, so the second day is often even better. Toast it and spread with good butter, or top with smoked mackerel, pickled cucumber and a squeeze of lemon. It is excellent alongside a thick vegetable soup, a bowl of mussels, or a plate of coastal cheese — something sharp and crumbly, perhaps with a little chutney. For a simple lunch, mash avocado with lemon and sea salt and pile it onto a thick slice.

To store, keep the loaf wrapped in paper or a tea towel for two days, or slice and freeze it. It revives beautifully in a hot oven or toaster.

Seaweed in the garden and along the shore

Seaweed has long been part of coastal gardening as well as coastal cooking. Dried seaweed meal is a slow-release soil conditioner, rich in trace elements, and a light sprinkle in a potato trench or around hungry brassicas is a traditional seaside trick. If you garden by the sea, a diluted feed made from well-rotted seaweed can help plants withstand salt-laden winds. Do not use bread-grade seaweed in the garden if it has been salted or flavoured, and never take more from the shore than you need.

Baking this loaf is a small act of maritime heritage. It connects the oat field, the garden and the tide in one tin. Whether you live within sight of the sea or simply long for it, the result is a sturdy, savoury bread that tastes of place — and asks for nothing more than butter, soup and a little time.