In a large bowl, mix cilantro, scallions, garlic, ginger, soy sauce and mustard. Add tuna and stir to coat.
Make 16 patties out of tuna mixture. Place patties on a plate and refrigerate for 30 minutes.
Heat 1 tsp. olive oil in a nonstick skillet over medium-high heat. Add 5 or 6 patties and cook until just cooked through, 2 to 3 minutes per side. Repeat with remaining patties.
Top each bottom bun with lettuce, if desired, 1 slider and 1 tsp. pickled ginger, then cover with top bun. Serve immediately.
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