Get about a litre of veg stock, bring to boil and stir in:
1tbsp each of soy sauce, Chinese rice vinegar, sugar and lime juice
2tbsp thai fish sauce
Thumb of ginger, 1-2 red chillies and 4 cloves garlic - minced/finely sliced
Simmer 2 mins then add whatever veg you like, a bag of stir fry veg works for convenience, but little broccoli florets, peppers, spring onions, pak choi, carrots, green beans, shredded cabbage, bean sprouts, water chestnuts, any combo. Check flavouring - may need more sugar for sweetness, fish sauce for saltiness or lime juice for sour...
3 mins simmer then if adding prawns/chicken then I would add these now (salmon I bake with chilli/soy/ginger and serve on top of soup)
When veg has softened whisk 2/3 eggs in a cup then stir into soup, the more you stir the more it breaks up in the soup, so stir once/twice and leave it to set in larger pieces or stir, as you prefer.
Serve over noodles if you like, with coriander and lime segments optional.