Green curry with sweet potato and eggplant

I love eating curry but I don’t eat it very often. This is partially due to not eating out very often in Thai restaurants (maybe the Thai restaurants here aren’t so good?!) and not really knowing how to make curry.
Recently, I came across this curry recipe and I figured I had to give it a try.

Hans and I enjoyed the outcome, but I will have to work out some kinks to make this recipe better. Any input is GREATLY appreciated.

Ingredients (4 servings)
1 tablespoon olive oil (some extra oil to possibly add later)
1 medium onion, chopped
1-2 tablespoons green curry paste
1 eggplant, quartered and sliced
1 1/2 cups (375 ml) coconut milk
1/2 veggie bouillon
1 cup water
(6 kaffir lime leaves, I could not find these and left them out)
1 orange sweet potato, cubed
2 teaspoons raw organic sugar (I would suggest only…