1 cup buckwheat flour
1/2 cup kamut or white spelt flour (can also substitute with all-purpose flour)
130 to 150 millilitres hot water
Combine the buckwheat flour and kamut or spelt flour in a large mixing bowl. Add the water gradually, and then work the flours and water together, kneading to form the dough. If at any point the dough feels too crumbly, add a little more water. Alternatively, if the dough it is too sticky, add a little more kamut or spelt flour.
Knead the dough until it comes together in a smooth, round ball, then turn it out on the counter and knead it with the heel of your hand. The dough should be soft and smooth; if any cracks appear, add a little more water.
Once it's smooth, shape the dough into a flat rectangular parcel. This will help the dough keep its shape as you roll. Sprinkle the semolina or buckwheat starch onto the counter and lightly over top of the dough, which will prevent sticking. Now it’s time to start rolling out the dough: The best way is to roll from the center outwards, shaping the edges as you go so that the dough remains rectangular. This will save you from having to trim later.
Spread a generous handful of semolina or buckwheat starch over the dough. Then fold the top third of the dough down and spread it with more starch. Fold the bottom third of the dough upwards, like you would fold a letter, and coat that with the semolina or starch, as well. Begin cutting the noodles approximately half a centimeter (a quarter of an inch) thick.
Keep slicing until you have used all of the dough. Toss the cut noodles with a little more semolina or starch so that they don’t stick together.
Bring a large pot of water to a boil, salt the water generously, and drop in the soba. Cook the noodles for one minute, then drain them, and rinse them under cool water immediately.
Use your hands to lift and gently shake the noodles as you rinse them; this helps to remove the starchy film that coats the noodles as they cook. After rinsing, drain the noodles and serve them cold or at room temperature. I like to toss the noodles with garlic oil, toasted sesame oil, and soy sauce. Then I scatter chopped spring onions and toasted cashews over top and finish the salad with chunks of mango.
The noodles store well in the fridge for a couple of days, and I often double the recipe and store the leftovers in a Tupperware for handy lunches.