For the chutney, peel and finely chop the shallots. Clean, seed, wash and finely chop the chilli. Clean, wash and finely chop the rhubarb. Heat 2 tablespoons of oil. Fry shallots, chilli, mustard seeds and rhubarb.
Add honey. Deglaze with vinegar, bring to the boil and simmer at low heat for about 30 minutes.
Season with salt and pepper. Wash and peel the asparagus and cut off the woody ends generously. Cut the asparagus diagonally into pieces. Heat 2 tablespoons of oil and butter in a large frying pan. Stir-fry the asparagus for about 10 minutes at medium heat.
Season with salt.
Wash the chervil, shake dry and pluck the leaves. Crumble the feta coarsely and add to the asparagus. Fry together for about 5 minutes. Fold in chervil and serve with rhubarb chutney.