To prepare mustard sauce, combine yogurt and mustard. Cover and refrigerate until serving.
Heat oil in a frypan over medium-low heat. Add onions, thyme, salt and pepper. Cook until golden brown, about 20 - 25 minutes; keep warm.
Grill sausages over low heat on natural gas barbecue, turning occasionally, for 10 - 12 minutes or until completely cooked.
Spoon onions into buns. Place 1 - 2 sausages in each bun. Drizzle with mustard sauce.
Nutritional analysis per 1 inch wedge:393 calories, 21 g fat, 18.1 g protein, 32.9 g carbohydrate, 2.1 g fibre, 892 mg sodium
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