Sri Lankan-style sweet potato curry

Name: Sri Lankan-style sweet potato curry
Prep time: 10 min
Cook time: 40 min
Total time: 50 min
Cuisine: Asian
Ingredients: ½ onion, roughly chopped; 3 garlic cloves, roughly chopped; 25g piece ginger, peeled and chopped; 15g fresh coriander, leaves and stalks separated, leaves chopped; 2½ tbsp medium tikka curry powder; 60g pack cashew nuts; 1 tbsp olive oil; 500g Redmere Farms sweet potatoes, peeled and cut into 3cm chunks; 400ml tin Island Sun coconut milk; ½ vegetable stock cube, made up to 300ml; 200g Grower's Harvest long-grain rice; 300g frozen green beans; 150g Redmere Farms spinach; 1 Suntrail Farms lemon, ½ juiced, ½ cut into wedges to serve