Vegan 'cheesy’ leek crumble

Name: Vegan 'cheesy’ leek crumble
Prep time: 20 min
Cook time: 55 min
Total time: 1 h 15 min
Cuisine: European, British
Ingredients: 80g unsalted cashews; 100g carrots cut into 1cm cubes; 350g potatoes cut into 1cm cubes; 60ml olive oil; 5 tbsp nutritional yeast; ½ lemon juiced; 2 garlic cloves; 1 tsp English mustard; 1 tsp good-quality vegan white wine vinegar; 4 leeks (about 500g), sliced; 50g rolled oats; 50g flour; 25g unscented coconut oil melted; 3 tbsp chopped thyme leaves