Toast the bread and mash the avocado with lemon juice and salt.

Spread avocado over two toast slices and top with folded turkey and lettuce.

Spread mayonnaise on both sides of two middle toast slices and set them over the turkey.

Add bacon and tomato, then close with the remaining toast spread lightly with mayonnaise on the inside.

Secure with four toothpicks, cut each sandwich into quarters and serve.