Finely dice the onion and garlic. For a deeper flavour, soften them in a little oil for 5 minutes first (optional).
Add all the ingredients to the slow cooker, stir and cook on high for 3.5 hours or low for 7 hours.
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Notes
Step-by-Step Photos: My blog post includes helpful step-by-step photos to help guide you through making this recipe.Substitutions & Variations: I have included a list of these in the post above.To Store: Cool quickly, then keep in an airtight container in the fridge for up to 2 days. Reheat once, in a pot or pan over a low heat or in the microwave, until piping hot.To Freeze: Allow to cool, then store in a sealed container in the freezer for up to 3 months. Defrost in the fridge overnight and reheat until piping hot in a pot or the microwave (you may need a splash of water).Tip 1: No curry powder? Use 1 tsp each of ground turmeric, garam masala and ground cumin.Tip 2: If you love spicy curries then just up the curry powder or add in chilli flakes to taste.Tip 3: Got any spare veg in the bottom of the fridge? Add it 1 hour before the end of the cooking time, or stir in spinach for the last 10 minutes.