These are a great supper dish - but you could also assemble lots of them and and take them on a picnic. I would add some chilli to mine.
4 slices of grainy bread
4 slices of bacon - cooked until crispy
4 iceberg lettuce leaves
4 slices of nice tomatoes
1 avocado mashed with the juice of a lemon and some coriander
2 tablespoons of mayonnaise
some basil leaves
Salt and Pepper
And then assemble two sandwiches with equal parts of the above ingredients.
Eat with a HUGE glass of red wine to cut the richness a wee bit.