1. Prepare the salad by mixing together tomatoes, cucumber, red onion, herbs, lemon juice and olive oil. Season with salt and pepper.
2. Make the sauce by whisking together tahini, lemon juice and water. Season with salt and pepper.
3. Arrange avocado halves on a plate or platter and fill each with 2 tablespoons of hummus, salad, tahini sauce and a tablespoon of hempseeds on each. Serve immediately.