Activate the yeast: In a large mixing bowl, stir the warm water, caster sugar, and dried yeast together. Let it sit for 5-8 minutes until the surface becomes foamy and smells distinctly yeasty - like fresh bread rising in a bakery. If nothing happens, your water may have been too hot or your yeast is old. Start again with fresh ingredients.

Make the dough: Add the flour, salt, and melted butter to the yeast mixture. Stir with a wooden spoon until a shaggy, rough dough forms - it will look lumpy and uneven, with some flour still visible at the bottom of the bowl. Tip the dough onto a lightly floured surface and knead for 8-10 minutes. The dough should transform from sticky and rough to smooth, supple, and slightly springy. When you press a finger into it, the indent should slowly bounce back.

First rise: Place the dough in a lightly oiled bowl, cover with a clean tea towel, and leave in a warm, draught-free spot for 1 hour. The dough should double in size - when you poke it gently, the indent remains. The aroma at this stage is deeply yeasty and comforting.

Shape the pretzels: Punch the risen dough down gently to release the air. Divide it into 8 equal pieces (about 100g each if you want to be precise). Roll each piece into a long rope about 60cm long - keep your hands lightly floured to prevent sticking. The rope should be even in thickness. Form each rope into a U-shape, cross the ends over twice, then fold them down to create the classic pretzel knot. Press the ends gently into the bottom curve to seal. Place on a baking tray lined with baking paper and repeat with the remaining pieces.

The baking soda bath (crucial step): Bring a large pot of water to a rolling boil and add the bicarbonate of soda. Carefully lower 1-2 pretzels into the boiling water using a slotted spoon. Boil for 30 seconds on each side - you will see the pretzels puff up slightly and become glossy. The water will smell distinctly alkaline, which is exactly what you want. Remove with the slotted spoon, letting excess water drip off, and place back on the baking tray. Brush each boiled pretzel with beaten egg - this gives them that gorgeous mahogany sheen.

Bake to golden perfection: Preheat your oven to 220°C (200°C fan). Bake the pretzels for 12-15 minutes, rotating the tray halfway through. They are done when they are a deep golden brown and the kitchen smells utterly intoxicating - warm, buttery, and toasty. The bottoms should sound hollow when tapped.

The cinnamon sugar coating: While the pretzels are still hot (but cool enough to handle), brush each one generously with melted butter. Mix the granulated sugar and ground cinnamon together in a shallow bowl. Dip each buttered pretzel into the cinnamon sugar, turning to coat every surface. The butter will make the sugar stick and create that signature crackly, sweet crust. Serve immediately while they are still warm and the butter is melted.