Mix the milk and eggs together in a jug with 1/2 tsp salt and 1/4 tsp ground black pepper. Sift the flour into a bowl, make a well in the centre and pour in the egg mixture in a thin, steady stream, whisking well until combined. Stir in the sweetcorn, spring onions, lemon zest and tuna.

Heat a drop of oil in a non-stick or cast iron frying pan over a medium heat. Drop spoonfuls of the batter into the pan and cook until crisp and golden, about 2-3 mins, flip and repeat on the other side (you'll need to do this in batches). Keep warm in a low oven and repeat with the remaining batter.

Serve the hot fritters with the lemon wedges for squeezing over, the soured cream and hot sauce, if using.