In a bowl, combine the flour, baking powder and a pinch of salt.
Create a well in the centre of the bowl, add the egg yolk and stir in the buttermilk until smooth. Mix in the melted butter.
Cover with cling film and rest for one hour or overnight, in the fridge.
Next, prepare the chimichurri dressing: In a second bowl, add the parsley, coriander, shallot, garlic, and chilli. Season with salt, pepper, olive oil, lime juice and zest and toss to combine. It should remain of a coarse texture. Keep aside covered until needed.
Prepare the cream cheese mixture; in a third bowl, combine the cream cheese, the rest of the lime zest and salt and pepper. Stir to soften the mixture and keep aside.
Now, just before serving the starter, finish and cook the blinis.
In a bowl, beat the egg white until light and fluffy.
Fold the egg white into the batter to lighten the mixture. Check the consistency of the batter - it should be thick but pourable!
Heat the oil in a large non-stick frying pan, over low heat. Drizzle a little oil and using a soup spoon, pour a few 3-4 cm diameter blinis into the pan.
Cook for around 1-2 minutes until small bubbles appear on the surface of each pancake, then turn and cook for another 30-45 seconds, until fully cooked in the centre.
Remove from the pan onto a serving dish.
Spread on some cream cheese mixture, then top each one with some small smoked salmon slices and sprinkle with chimichurri dressing.