Peel and grate the garlic (or use a garlic press). 

Trim the pak choi, then thinly slice widthways. Trim and halve the green beans.

Zest and halve the lime.

Heat a drizzle of oil in a large saucepan on high heat.

Once hot, add the mushrooms to the pan and fry, stirring occasionally, until browned, 5-6 mins.

Stir the red Thai style paste, Thai style spice blend (add less if you'd prefer things milder) and garlic into the mushrooms. 

Stir fry for 1 min. 

Pour the coconut milk, soy sauce, sugar and water for the soup (see pantry for both amounts) into the pan.

Bring to the boil, then add the green beans and the pak choi. Simmer until just tender, 4-6 mins.

Add the udon noodles to the soup and cook until warmed through, 1-2 mins.

Remove the pan from the heat. Stir in the lime zest and half of the lime juice. 

Taste the soup and add more salt, pepper, lime juice or sugar if needed. 

Share the udon noodle soup between your bowls.

Cut any remaining lime into wedges for squeezing over.

Enjoy!