Kingfish skewers

Name: Kingfish skewers
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: Southern, American
Ingredients: 800 gm skinless kingfish fillet, cut into 2cm pieces; 1 small lemon, very thinly sliced, plus extra slices to serve; 1 tbsp olive oil, plus extra for drizzling; 200 gm fresh borlotti beans (about 400gm unpodded); 1 celery heart, thinly sliced, pale leaves reserved; ¼ cup coarsely chopped flat-leaf parsley ½ lemon, thinly sliced,; ½ lemon, thinly sliced, plus juice of ½ lemon; 1 garlic clove, crushed; 60 ml (¼ cup) extra-virgin olive oil