Wash and dry the endive salad, cut into 1 cm strips and place in a bowl. Peel the onion, cut into fine slices, clean and finely chop the spring onions and add both to the salad. Wash the apples, remove the core, cut the apples into wedges and then thinly slices, drizzle with lemon juice and fold into the salad.
For the dressing, mix the lemon juice with the mustard, vegetable stock, sugar and lemon vinegar in a bowl. Season with salt and pepper and cayenne pepper. Finally mix in the grape seed oil. Dress up the apple and endive salad with the mustard dressing, let it steep for a moment, and arrange decoratively. Garnish with sprigs of herbs.