Creamy Green Lentil Dahl

Name: Creamy Green Lentil Dahl
Prep time: 5 min
Cook time: 55 min
Total time: 1 h
Cuisine: Indian
Ingredients: 2 tbsp rapeseed or sunflower oil; 1 red onion; 2 garlic cloves; thumb-sized piece fresh ginger; 1 green chilli; 2.5 tsp garam masala; 1 tsp turmeric; pinch chilli flakes; 200 g dried green lentils; 400 ml coconut milk (from a tin); 550 ml vegetable stock; handful baby spinach or curly kale; 1 lemon