Vegetable soup - short and simple

This one turned out lovely by fluke, so although I'm putting it up I'm not too sure of its success. Whatever it is, it's simple and nutritious!

Ingredients(measurements not at all accurate):
4 small Carrots(200g), cut into sticks of equal volume
Beans(150g), cut into about 2 inch long pieces.
Peas(200g after shelling)
1 medium Onion, cut into semi-rings of about 1/8in thickness
1 inch Ginger, cut into thick slices
4-5 peppercorns, slightly crushed.
Salt to taste(about 1.25 tsp)
Butter on top(optional but delicious).

Method:
Add salt, ginger and beans to water, bring to boil.
After about 1 minute add carrots and peppercorns. Some trial and error necessary to figure out the relative timings and how to cut the veggies for uniform boiling.
After another minute or two add peas and onions.
Boil until vegetables are soft to taste.
Remove from flame and add butter.

Using onions and ginger without garlic gave the soup a wonderful flavour. I'll try experimenting with onion/garlic and ginger/garlic some time.