Heat olive oil in a deep pot. Add onion and carrot. Cook for 10 minutes or until starting to show signs of softening. Add sweet potato and garlic. Give that a good mix around. Pour in chicken stock, add lime leaf, fish sauce and pinch of salt. Bring to a simmer. Cook, uncovered for 40 minutes until sweet and soft. Remove lime leaf. Blitz in blender (always find this ends with the silkiest soup), taste and adjust seasoning. Serve with lime wedges.

PS. If you like your soup extra thick, than start with 400ml. If you're finding you need more stock, add more (or water) to help bring it to the consistency you like.

For punchy herb mix – I blitz a handful of parsley leaves, coriander leaves, 1 garlic clove and a green chilli in a food processor. Then pour in about ¼ cup of olive oil, zest of lemon and season with salt. Blitz. Stir in toasted sesame seeds.