Place the mustard, vinegar, salt and pepper into a bowl.
Whisk for 20 seconds, then gradually add the oil, whisking to emulsify nicely.
Next place the spinach, onion and cheese into a bowl and lightly mix together.
Add the strawberries and JUST fold in, do not break them up.
Spoon over half the dressing and season lightly and fold in.
Place on a plate and sprinkle over the nuts and serve extra vinaigrette on the side.
All must be a room temperature to get the best flavours out.