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Cook the French fries following pack instructions. Meanwhile, heat the olive oil in a frying pan and fry the onion for 10 mins. Prepare the guacamole by mashing the avocado and mixing in the lime juice, red onion and chopped tomato.
Add the garlic, chipotle paste, ground cumin and ground coriander to the onions, which should be softened and translucent. Fry for 1 min, then tip in the mixed beans and the chopped tomatoes. Simmer for 10 mins, then stir in most of the coriander and season. Tip the fries into a bowl and top with the bean chilli, guacamole, crème fraîche and crispy fried onions. Scatter over the remaining coriander and serve with lime wedges.