Asian pork and vegetable soup

Ingredients

• large piece raw gammon (about 400-500 gram)
• sunflower or vegetable oil
• 3 litres water
• 1/2 broccoli head
• 1/2 leek
• 2 carrots or 5 Dutch carrots
• 1 red pepper
• a small handful of white button mushrooms
• 1/2 pak choi
• piece of ginger root (about a thumb)
• 1 lime (juice only)
• a small handful of bean sprouts
• 2 scallions/spring onions
• small bunch of enoki mushroom
• soy sauce to taste
• pepper and salt to taste