1. Preheat the oven to 185 °C (365 °F). Place the lamb shanks in a dish. Make incisions in them and insert the peeled garlic cloves. Rub the meat with Cajun spices and chipotle chili. Add the diced butter and chopped thyme. Roast for 2 hours.
2. Cook the lentils according to the instructions on the packaging, with the bouillon cube. Drain them and let them cool.
3. Cut the cherry tomatoes in half and blend them in a food processor with the garlic clove and 7.5 cl (2.5 fl oz) of olive oil. Cut the mango flesh into very small cubes. Mix them in a bowl with half of the chopped coriander, the lentils, the tomato vinaigrette, the grated lemon zest, and its juice. Season with salt and add a pinch of Espelette pepper. Cover and let it rest in the fridge.
4. Remove the leaves from the pak choi and cut the stalks in half lengthwise. Sauté everything for 1 minute in a small casserole dish with 3 tablespoons of olive oil. Cover and let it sweat for 10 minutes over low heat.
5. Remove the meat from the lamb shanks and shred it, mixing it with the crushed garlic cloves. Add the honey and soy sauce. Adjust the seasoning.
6. Fill the tacos with the pak choi, meat, and a little salsa. Sprinkle with finely chopped chili and coriander. Serve the remaining salsa on the side.