Thinly slice all the vegetables or use a food processor to cut everything. You will save some time with this last option.
Mix all the ingredients in a big bowl and add the cumin seeds.
To prepare the sauce, pour into a hand blender jug the soaked cashews, mustard, olive oil, water, maple syrup, lemon and vinegar. Blend with a hand blender until you get a smooth consistency.
Pour the sauce into a big bowl with the rest of the ingredients and mix everything together until perfectly combined.
Serve intermediately or leave in the fridge for the following day.