You can use an oven to toast the back or use a non stick pan (but it's harder). When done. Slice off the sides.

Boil your egg, bring down. Peel the pack and chop to bits.

Slice the cabbage and grate the carrot into bits. Mix it with the chopped Egg and Mayonnaise. Slice your Tomatoes and Cucumber round. Set aside.

Open your sardine and mix with margarine. Set aside

This is a 3 layers set up. So in one layer, put your cabbage,egg/mayo mixture then 1 tomatoes,1 cucumber Then your lettuce. In the next later, spread your Sardine/margarine mix on it. Repeat this process till you get the desired no of Filled sandwiches. You can then slice it into halves to get the Sandwich shape. Then it's ready. You can put it in the fridge for slight chilling or use a toothpick to hold it in place and serve.