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Holding the lemon with your hand in the bridge position, cut the lemon in half. Push one half onto a citrus juicer, twist and squeeze to release the juice. Repeat with the second lemon half. Pour the juice into a jam jar or small bowl along with the oil.
Add the mustard, honey and a good pinch each of salt and black pepper. Seal the jar and shake to combine, or whisk the ingredients together. Will keep covered in the fridge for up to a week.
Cut the tomatoes in half by pinching each one between your thumb and a finger and carefully slicing through the middle with a small serrated knife. Cut each piece in half again to make quarters, then tip the tomatoes into a large bowl.
Wipe down the chopping board, then cut the cucumber in half lengthways. Put the two halves cut-side down on the board so they don’t roll around, then cut in half again along the length, so you have four chunky sticks of cucumber. Cut across the cucumber now to make little triangles, keeping your free hand in the claw position with your fingers tucked away from the blade of the knife. Tip the cucumber into the bowl with the tomatoes.
Cut the hard stalk off the lettuces, then cut each lettuce in half and in half again to get four wedges. Working with one lettuce wedge at a time, hold the wedge with your hand in the claw position and chop it into small ribbons – the smaller, the better for this salad. Repeat with the remaining wedges and tip the lettuce into the bowl.