Buckwheat blinis with scrambled eggs and smoked salmon

Name: Buckwheat blinis with scrambled eggs and smoked salmon
Ingredients: 85g/3oz buckwheat flour; 1 tsp baking powder (gluten-free, if necessary); salt and freshly ground black pepper; 150ml/5fl oz full-fat milk (lactose-free, if necessary); 1 tsp mustard powder; 70g/2½oz cheddar, grated; small handful chopped fresh chives; 2 free-range egg whites, preferably organic; pinch salt; knob of unsalted butter; 4 free range or organic eggs (plus 2 free-range egg yolks); sea salt and freshly ground black pepper; 2 tbsp chopped fresh chives; 250g/9oz smoked salmon; 1 lemon, cut into wedges