Mashed Broad Beans with ‘Snow Vegetable’

Name: Mashed Broad Beans with ‘Snow Vegetable’ (Dou Ban Su 豆瓣酥)
Cuisine: Yangtze
Ingredients: 1 tbsp finely sliced spring onion greens; 3 tbsp finely chopped snow vegetable; 300 g podded broad beans (just over 1 kg in the pod); Salt; 3 tbsp cooking oil or lard