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1
Place the ground beef in a glass or ceramic bowl. Pour over the lime juice, turn to coat thoroughly, cover, and refrigerate for a minimum of 4 hours (up to 6 hours is fine). Turn the meat every hour so the acid reaches all surfaces evenly. The beef is ready when it has lost its raw red colour throughout.
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2
Remove from the refrigerator. Add the onion, tomatoes, cilantro, chile, olives, sweet red pepper, and olive oil. Fold together gently.
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3
Season with sea salt and freshly ground black pepper. Taste and adjust chile and acid if needed.
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4
Rest in the refrigerator for 20–30 minutes, then serve mounded on tostadas or alongside hot corn tortillas. Top with shredded cabbage, tomato slices, and egg if desired. Serve immediately.