Bring a pan of water to the boil and blanch the asparagus for 2-3 mins. Add the shallots to the pan for 30 secs then drain and run the vegetables under cold water.
Drain again and put into a salad bowl with the courgette, feta, poppy seeds and tarragon.
For the dressing, place the juice of the lemon, oil, mustard and crème fraÎche in jar with a screw top. Season and shake to combine. Drizzle over the salad and toss well. Taste and adjust seasoning if necessary.
Recipe by appetite magazine at https://www.appetitemag.co.uk/shallot-courgette-asparagus-salad/