Step 1

For the pancakes, whisk eggs, milk, onion and oil in a bowl. Stir in potato, flour, baking powder and lemon juice, then season well with sea salt and freshly ground black pepper. Brush a non-stick frypan with butter and place over medium heat. In batches, add 1 tablespoon mixture to the pan for each pancake, allowing room to spread. Cook for 1 minute each side until golden and slightly puffed. Keep warm while you make 24 pancakes in total.

Step 2

Top 8 pancakes with hollandaise and asparagus; 8 with creme fraiche, smoked salmon and chives; and 8 with creme fraiche, roe and herbs. Place on a serving platter or plates, then serve with lemon wedges to squeeze over.