Remove the outer lettuce leaves. Gently tear off the remaining leaves from the core - wash them then wipe dry with a clean kitchen towel. Put them in a serving dish.
Mix the Harissa with the lime juice, chopped herbs and olive oil. Taste it, then season with salt& pepper to your liking, and adjust the Harissa/lime juice if necessary.
Lightly toast the almonds in a frying pan (no need to add oil) until golden. Set aside.
Cut the spring onions into long, thin strips.
Scatter the toasted almonds, spring onion slices and olives on top of the lettuce, then then pour over the sauce.