Rinse the tripe to remove the bleach smell. Repeat. Add to a pot with water and bring to a simmer. Cook 30 minutes. Strain. Rinse. Slice the tripe into slices. Add to a pot with the rest of the ingredients. Simmer about 3 hours until tender. Add more stock as needed if the liquid evaporates.
Make the salsa verde by mixing all the ingredients in a blender or food processor.
Toast the bread and rub it with some garlic.
Strain the tripe and reserve the cooking liquid. Add the tripe to a hot pan with some butter. Saute to lightly brown. Add a ladle of the cooking liquid to deglaze. Cook 1 minutes as the sauce forms. Make the sandwiches with the tripe and some salsa verde on top.
