Add the butter to a small saucepan and heat over medium-low heat until the milk solids caramelise and the butter is dark golden brown.
Add the flour and 1 teaspoon flaky salt to a food processor and whizz to combine. Drizzle in half the melted butter and blend to combine well. With the machine running, add enough boiling water (about 100g, depending on your flour) to form a supple dough that is not sticky. Continue blending for 1-2 minutes to knead the dough, until it is smooth, soft and a little shiny. Cover with plastic wrap and rest for at least 10 minutes.
Divide the dough into 8 pieces – keep the dough balls covered in plastic wrap while you work. Roll 1 dough ball into a 20cm round. Brush brown butter evenly over the dough round and sprinkle with a tiny bit of flour. Roll another 20cm round and lay over the first. Fold the edges of the dough into the centre, making a rough hexagon. Turn the package over, sprinkle with a little flour and roll out again into a 20cm round.
Heat a large, heavy frying pan over medium heat until very hot (you don’t need any extra oil). Add a rolled paratha to the pan – it should bubble in about a minute and be spotted brown on the heated side. If it takes much longer than that, the paratha will dry out before it browns and become tough and inflexible, so adjust the heat accordingly. Flip the paratha and cook for another minute to brown the other side. Keep the cooked parathas soft as you work by wrapping the stack in a clean, lightly damp tea towel.