1Peel prawns and mince, mix with minced garlic, salt, pepper, and smoked paprika to form a paste.
2Add egg white to the prawn mixture and mix until well combined and slightly elastic; pulse if chunky.
3Spread prawn paste over corn tortillas to form a thin layer for prawn toast (tostada).
4Rinse and set aside prawn shells; heat gently with a little oil to infuse flavors, then blitz to a light mayo-like infusion.
5Prepare gazpacho-style dip: blend chopped tomatoes, shallots, garlic, jalapeño, salt, pepper, and tortilla moisture until smooth; emulsify with prawn head oil or olive oil until silky.
6Fry prawn toasts in hot oil until bouncy on one side and crisp on the other; drain on paper towels.
7Assemble: dip prawn toast into the tomato gazpacho, add a drizzle of prawn shell oil and a few slices of jalapeño; serve immediately.