Cook a few big lentils - I usually keep some ready cooked in the freezer, so very easy to use a handful from there. Red lentils wouldn't really work here
50 g cooked lentils
Peel and chop the egg
Mix the egg and cooked lentils with a little curry powder, a few raisins and a spoon of mayonnaise
1 tsp curry powder, 20 g raisins, 1 tblsp mayonnaise
Then spread the whole mixture on one of your slices of bread, top with the second and cut in half
2 slices bread
Notes
What variations are there for a lentil sandwich with egg
A few green leaves would be nice, spinach from the garden perhaps, or a bit of lettuce, or maybe a few herb leaves, basil or parsley
You could use any dried fruit to add that note of sweetness; sultanas, currants, diced apricots, chopped dates etc
You could use the mix in a pitta or wrap, or on top of a jkt potato, or with some crudite (carrot batons and celery perhaps)