Mustard coated Pork with Peppers and Salad

Name: Mustard-coated Pork with Peppers and Salad
Ingredients: 600 grams Pork tenderloin; 1 tablespoon Mustard; 2 tablespoons white Peppercorns; 2 tablespoons black Peppercorns; 4 Red Bell peppers; 60 milliliters Olive oil; 1 tablespoon Balsamic vinegar; 2 Garlic cloves; ½ sprig fresh Rosemary; Salt; freshly ground Pepper; 200 grams Tongu mushroom; 2 tablespoons Olive oil; 100 grams green Chicory rosette (or arugula); 1 tablespoon white Balsamic vinegar; 1 generous pinch Mustard; Sugar; Pepper