Preheat oven to 350F.
Heat a grill pan to medium heat. Grill pineapple rings until there are marks on both sides around 2-4 minutes. Cool, then dice.
In a large bowl, combine the olive oil, mayonnaise, Dijon mustard, parsley and mint. Stir in the chicken, celery, red onion, red pepper, diced pineapples and almonds; season with salt and pepper.
Top lettuce cups with chicken salad and serve.