Step 1

Place lime juice, onion and 1 tsp salt flakes in a bowl and set aside to soften slightly. Scoop avocado into a bowl and roughly mash. Add garlic, coriander, jalapeno and the onion and lime juice mixture. Fold to combine. Season to taste, then transfer to a bowl.

Step 2

Scatter with watercress and drizzle with oil. Scatter cucumber with paprika, cumin and salt flakes, and serve alongside.