In a food processor, combine frozen peas, optional pea shoots, grated parmesan, olive oil, lemon juice, half a garlic clove, salt, and black pepper. Pulse until a rough paste forms, about 30 seconds.

Preheat broiler or grill to medium-high. Cut ciabatta into 0.5-inch thick slices and arrange on a baking sheet. Drizzle with olive oil and toast for 2-3 minutes on each side until golden brown.

Rub the toasted ciabatta slices with the remaining half of the garlic clove for flavor.

Spread the pea topping over the toasted slices, garnish with extra parmesan, lemon zest, and pea shoots if using, then drizzle a little olive oil and sprinkle with black pepper.