Chop up all vegetables.
In a large pot, begin by cooking olive oil.
Toss in chopped onions, garlic and ginger.
After about 3 minutes, toss in mushrooms and cook until softened.
Add the chopped bell pepper, carrots, and broccoli.
Pour in the vegetable broth and coconut milk. Bring to a simmer.
Add the Thai paste and stir well.
Add the lemongrass stems and simmer for 10 minutes.
Remove the lemongrass stems.
Stir in the chopped basil leaves.
Season with salt to taste.
Serve hot with a wedge of lime and a drizzle of chili oil.