1.Tie spices, herbs and garlic in a muslin bag; secure with kitchen string. Place onion in base of a 4.5-litre (18-cup) slow cooker. Top with muslin bag and pork. Pour combined wine, stock, sauce, sugar and vinegar over pork. Cook, covered, on low, for 7 hours 30 minutes. Add cabbage; cook, covered, on low for a further 30 minutes. Discard muslin bag; season to taste.
2.Just before serving, make sweet potato mash. Boil, steam or microwave sweet potato and potato until tender; drain. Mash vegetables with butter in a medium bowl until smooth; season to taste.
3.Carefully remove pork from cooker; break into large chunks.
4.Serve pork with sweet potato mash and cabbage and onion mixture; drizzled with some of the cooking liquid. Top with extra tarragon.
Accompany with baby spinach and crusty bread to mop up the juices.
Not suitable to freeze.
Note
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