Add the potatoes to a roasting tray (I cut some of the larger ones in half) then toss to coat them on olive oil, garlic powder & salt. Roast for approx 50- 60 minutes until crispy on the outside.
To make the bolognese
Add the olive oil & onion to a large pan and heat to a medium heat. Fry for approx 8-10 minutes until soft and browning.
Add in the garlic, spices and stir for another few minutes, then add in the chopped mushrooms and red peppers and fry for 2-3 minutes.
Add the walnuts to a pan and fry toast until lightly toasted. Allow to cool a little, then add them along with the carrots and sun-dried tomatoes to a food processor and blitz to a chunky crumb.
Add the walnut mix to the pan, along with the tomatoes, lentils, water, harissa, balsamic and tamari.
Simmer for 25 minutes.
Season with salt, pepper
To make the tahini dressing
Add all the ingredients to a jar and mix to combine.