Preheat oven to 180°C. Line a baking tray with greaseproof paper. Toss potatoes in 1 tbsp olive oil and season with salt and pepper. Spread potatoes in a single layer on prepared tray and bake for 30 minutes.
Coat lamb with McCormick cumin, coriander, salt, pepper and 1 tbsp oil. Heat a frypan to medium heat and cook for 3 minutes each side or until cooked to your liking. Set aside to rest 5 minutes before slicing.
Whisk together honey, 1 tbsp olive oil, salt and pepper.
In a large bowl, toss spinach, sweet potatoes, lamb, cashews, dressing and then serve.