Grilled Pork and Pineapple Skewers with Achiote Sauce

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Wooden skewers

3 tablespoons vegetable oil

1 tablespoon achiote (annatto) seeds

1/2 cup red wine vinegar

5 garlic cloves, coarsely chopped

1 tablespoon seeded and finely chopped jarred aji amarillo peppers or fresh habanero

2 teaspoons ground cumin

2 teaspoons kosher salt

2 teaspoons freshly ground black pepper

1 pound pork loin, cut into 1-inch cubes

1 pineapple, peeled, cored, and cut into 1-inch cubes

1 large red onion, quartered, halved, and cut crosswise

1 head butter lettuce, such as Bibb or Boston

Lime wedges, for serving