– 1 14-oz can artichoke hearts, drained and roughly chopped – 1 14-oz can hearts of palm, drained and roughly chopped – 2 ribs celery, halved and thinly sliced – 1/2 cup roasted red pepper, roughly chopped – 1/2 cup vegan mayonnaise – 1/4 cup red onion, minced – 1 tbsp canola oil – 1/2 lemon, juiced – 1 tbsp dulse flakes – 2 tsp Old Bay Seasoning – 1/4 teaspoon sea salt – 1/4 teaspoon black pepper – 4 vegan sandwich rolls – Lettuce (optional)