Melt 20g butter in a saucepan over a medium heat. Once bubbling, scrape in the chopped leek, carrots and celery along with a pinch of salt. Cook, stirring regularly, for 10 minutes until veg is completely soft.
Meanwhile bring a kettle of water to the boil. Put the veggie stock cube into a jug, measure in 150ml of boiling water and whisk with a fork to dissolve.
Come back to the saucepan, add the garlic and ginger. Cook for 1 minute more, sprinkle in the curry powder and cumin seeds, spoon in the tomato puree. Give everything a good mix and cook for 2 minutes more, then tip in the drained green lentils and the veggie stock.
Bring the pie mix to a simmer, turn down the heat to low and leave to gently bubble away while you make the mash.
Pour the remaining water from the kettle into a saucepan and re-boil. Salt the water and drop in the cauliflower florets. Cook for 10 minutes until completely tender. Drain into a sieve and leave to steam for a few minutes – this will stop you from having watery mash.
Preheat the grill to maximum.
Tip the cooked cauliflower into a food processor, add the remaining butter and some seasoning, blitz to a smooth mash. You can also do this with a stick blender.
Come back to your pie mix. Add the frozen peas and season to taste. Once the peas have defrosted, spoon the filling into an ovenproof dish. Spread the mash on top, then grate over the cheddar cheese. Slide under the grill for s minutes or until bubbling and golden with a crispy top. My low-carb cottage pie.
About the chef
Joe Wicks, aka The Body Coach, is Britain's favourite healthy cook and fitness sensation – and a national treasure. His lockdown smash-hit 'PE With Joe' YouTube videos have been viewed 80 million times. He is the author of Lean in 15 - The Shift Plan, Lean in 15 - The Shape Plan, Lean in 15 - The Sustain Plan, The Fat-Loss Plan, Cooking for Family and Friends, Joe's 30-Minute Meals, Veggie Lean in 15, Wean in 15 and 30 Day Kick Start Plan.