|Values shown are approximate.|
Lightly butter the slices of bread.
Place the mayonnaise in a bowl and beat in the spring onions, capers, mustard, horseradish and a squeeze of lemon juice.
Season to taste and fold in the tuna.
Divide the tuna mayonnaise among four slices of the bread, then sandwich together with the rest of the slices of bread and cut each one in half.
Arrange on plates to serve.
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