First, make the poached lemon. Using a sharp knife, peel the lemon then cut either side of the membrane, and remove the segments one by one.
Tip the 100g of sugar into a small pan with 100ml water and bring to the boil. Remove from heat and slide the lemon segments into the syrup. Leave to cool at room temperature.
When ready to serve, separate the eggs, putting the whites into one bowl and the yolks into another. Sieve the flour, baking powder and cocoa powder together.
Add the milk to the egg yolks and mix with the dry ingredients to make a smooth thick batter. Whisk the whites with the salt and the tablespoon of sugar until they form stiff peaks and carefully fold into the batter.
Heat a non-stick pan on a medium heat, add a little oil, then pour small spoonfuls of the batter into the hot pan and fry for 20-30 seconds on each side, hook them out with a fork or spatula, keep warm and continue with the rest of the batter.
To serve, spoon a little crème Fraiche on top of the blinis, top with smoked salmon, one cube of beetroot, a segment of poached lemon and a couple of pea shoots or dill sprigs.