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1
Spread the ground beef in a single layer across a cold, heavy ungreased pan. Set over low heat.
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2
Cook, stirring occasionally to prevent sticking, until the fat has rendered out and the meat is cooked through — about 10 minutes. Do not allow it to brown.
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3
Add the onion. Cook, stirring, for 3 minutes until softened.
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4
Add the tomato, parsley, and a modest pinch of sea salt. Stir to combine.
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5
Continue cooking over low heat until the mixture is fairly dry and holds together when pressed — about 8 minutes.
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6
Taste and adjust salt. Cool before filling flautas.