In a bowl, toss breadcrumbs with kelp powder or nori, garlic, paprika and salt. Dip tofu slices into olive oil and then into the breadcrumb mixture, patting lightly to coat well.
Place on a baking tray and bake for 30 minutes, turning when first side is golden brown and slightly crisp and browning the other side.
Meanwhile, mix together mayonnaise, pickled cucumbers and lemon juice until well blended. When tofu has almost finished baking, brush each bun half with olive oil, and lightly toast in the oven. Serve with tartare sauce.