Step 1

Place sausages in a large saucepan, add enough cold water to cover sausages; bring to the boil. Boil, uncovered, about 2 minutes; drain.

Step 2

Heat oil in same pan; cook onion, stirring, until softened. Add curry powder; cook, stirring, until fragrant. Remove from heat; stir in tomatoes, stock and the water.

Step 3

Place potatoes in a 4.5-litre (18-cup) slow cooker; top with sausages and onion mixture. Cook, covered, on low, about 8 hours.

Step 4

Stir in peas and sultanas. Season to taste.