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1
Mix the sausage meat, sage, onion and egg together in a large bowl and place in the fridge for at least 1 hour.
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2
Place the sugar and butter in a large frying pan and melt very gently, until the sugar is dissolved.
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3
Increase the heat, add the apple slices and cook for 5-6 minutes, or until softened and golden.
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4
Shape the sausage meat into 5 burgers and place under a hot grill, until cooked and browned.
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5
Top with the Cheddar, and grill until slightly melted. Halve the burger buns and spread with mayonnaise.
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6
Fill the buns with the sausage burgers and top with apple, watercress and bun lids.