Buttered Vegetables

Name: Buttered Vegetables
Prep time: 15 min
Cook time: 10 min
Total time: 25 min
Cuisine: World Cuisine
Ingredients: 1 medium onion; 200 g/ 7 oz/ about 1 ½ cups chopped green beans (Note 1); 200 g/ 7 oz carrots (about 3 medium); 350 g/ 12.5 oz/ about 4 cups cauliflower (about ½ a medium cauliflower); 100 g/ 3.5 oz/ ¾ cup frozen peas (Note 2); 60 g/ 2.1 oz/ ¼ cup butter (Note 3); 125 ml/ 4.2 fl. oz/ ½ cup vegetable stock; small bunch parsley (Note 4); fine sea salt and freshly ground black pepper