Chicken skewers with mustard and rosemary butter

Ingredients

• 1 ½ tbsp white flour
• 60 g butter
• 2 tbsp rosemary
• 4 spring onions
• 2 fennel
• 1 bunch radishes incl. green parts
• 1 tbsp coarse-grain mustard
• 1 tbsp mild mustard
• 2 tsp coarse-grain mustard
• 8 chicken breasts
• 8 wooden skewers
• 2 tbsp white balsamic vinegar
• 2 tbsp olive oil
• ¾ tsp salt
• a little pepper
• salt
• pepper