Mnemonic Device:

• Never Eat Cucumber, Eat Salmon Sandwiches And Remain Young

Variations:

• Never Eat Crisps, Eat Salad Sandwiches And Remain Young
• Never Eat Chocolate, Eat Salad Sandwiches And Remain Young
• Never Eat Cress, Eat Salad Sandwiches And Remain Youthful
• Never Eat Chips, Eat Salad Sandwiches And Raspberry Yogurt
• Never Eat Cress, Eat Salad Sandwiches And Rasberry Yogurt
• Not Every Cat Eats Sardines (Some Are Really Yummy)

Other Mnemonic Device:

• It is NECESSARY to have one (C)ollar and two (S)leeves

Variations:

• One Collar, Two Socks
• A vicar has one Collar and two Socks
• 1 Coffee and 2 Sugars
• One Coat, Two Sleeves

Explanation: memory devices for spelling the word NECESSARY