Spicy carrot & noodle soup with toasted sesame seeds

This is one of the quickest, easiest, tastiest things I like to eat. It's super simple and requires mostly store cupboard staples. It just about adheres to my theme by featuring locally grown carrot. And that's about it.

Ingredients (makes 3-4 portions)
1 medium onion
2 medium carrots, peeled and finely sliced (not coined...bleurgh!)
5-6 cups of water
Vegetable stock cube
200g soba noodles, broken in to thirds
2 tbsp nutritional yeast
1/2 tbsp tamari or soy sauce
1 tbsp toasted sesame seed oil
1/4 tsp garlic powder
1 tbsp tomato puree
1/2 tbsp sriracha
1 tbsp sesame seeds
Freshly ground black pepper

Method
Dice the onion and gently saute in the toasted sesame oil for a few minutes. Add the 5 cups of the water, stock cube and carrots, bring to the boil.
Add the remaining ingredients except for the sesame seeds and remaining cup of water and allow to simmer whilst you toast the sesame seeds in a separate pan (no oil required, they should be ready when they turn light brown). You may want to add another cup of water if your soup looks too thick.
When the soup is ready, serve with the toasted sesame seeds on top.