Preheat the oven to 180°C/ 350°F/ gas mark 4.
Place your eggs in a pot of boiling water for about 10 minutes or until they are hard boiled. Remove and leave to cool.
While the eggs are boiling, cut your baguette width ways. You will probably get about 10 1 ½ inch thick slices, depending on your roll.
Place the bread slices into the middle of the oven on a wire rack. Cook for about 5 minutes or until crispy.
Remove from oven and leave to cool.
While the bread is cooling, remove the shells from the eggs and cut into thin slices.
When he bread is cool, generously spread on a layer of mayonnaise.
Top with the cucumber slices and egg.
Garnish with the spring onion before serving.