Beef and lemon grass stir-fry

Name: Beef and lemon grass stir-fry
Prep time: 15 min
Cook time: 10 min
Total time: 25 min
Cuisine: Asian, Chinese
Ingredients: 1 x 250g pkt dried thin rice noodles; 2 teaspoons olive oil; 500g lean beef strips; 1 brown onion, halved, finely chopped; 1 tablespoon finely chopped fresh lemon grass; 2 teaspoons finely grated fresh ginger; 200g green beans, topped, coarsely chopped; 60ml (1/4 cup) sweet chilli sauce; 1 tablespoon fish sauce; 1 tablespoon fresh lime juice; Lime wedges, to serve