Rince the endive under cold water, remove the tip that is kind of reddish and slice the endive.
Peel the half apple and cut it into pieces. Crack the walnuts and cut them in small pieces then cut the cheese into cubes. Put all the ingredients in a large bowl.
In a glass, prepare the dressing by mixing the mustard, olive oil, vinegar, salt and pepper. Then pour it over the endive salad. Mix the salad to make sure it is well coated with dressing. Voilà! Serve immediately.Bon appétit!
Please keep in mind that the nutritional information is calculated using a nutrition facts calculator. It is a rough estimate and can vary greatly based on products used.