Place the tripas, onion, garlic, bay leaves, salt, and enough water to cover in a large stock pot.
Bring to a boil, then reduce heat and simmer for about 2 hours or until the tripas are tender.
Drain the tripas and allow them to cool slightly.
Chop into bite-sized pieces.
For soft tripas tacos, proceed directly to assembly.
For crispy tripas tacos, heat a skillet or griddle over medium-high heat and cook the chopped tripas for 10–15 minutes until browned and crispy around the edges.
Warm the tortillas on a hot comal or skillet.
Fill each tortilla with tripas.
Top with diced onion, cilantro, salsa, and fresh lime juice.
Serve immediately.