Pork medaillions with fresh tomatoes, shallot and asparagus

Ingredients

• 1 package of fresh asparagus
• 125 ml (1/2 cup) of finely sliced French shallots
• 2 chopped garlic cloves
• 60 ml (1/4 cup) of olive oil
• 125 ml (1/2 cup) of white wine
• 125 ml (1/2 cup) of beef broth
• 1 pork fillet (about 600 g)
• 12 small cooked potatoes sliced in two
• 4 red tomato slices
• 4 yellow tomato slices
• 60 ml (1/4 cup) of finely chopped fresh basil
• Salt and pepper