1. Put potatoes in pot and cover. Boil and cook potatoes for 10 - 15 minutes or until tender and knife goes in very easily. Make sure not to undercook or they will not smash well. Drain and return to pot.
2. While potatoes are cooking, cut leek into 1/2 inch pieces (white and light green parts only) and wash.
3. Cut up bacon with scissors into small pieces. Cook bacon in skillet until it starts to crisp. Add leeks and cook for 3 - 5 more minutes or until leeks are tender. Drain fat.
4. Smash the potatoes in the pot and add the chicken stock (a little at a time), leeks, bacon, and tomatoes and continue to smash. Season with salt and pepper and serve.