Ceviche, a South American specialty of raw fish pickled in citrus juice, requires no cooking.

NPR: Cool and Comforting Ceviche

Here, pungent fish sauce and plenty of lime juice keep the dressing pleasantly sour and sharp.

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When making the dressing, which takes less than one minute, Mr. Monis suggests adding extra lime juice, chilies, fish sauce or sugar to suit your palate.

WSJ: Johnny Monis's Northern Thai Grilled Pork Salad | Slow Food Fast

Fresh tacos, fruit juice, coconuts and fish can be easily found at stalls near Mercado Mexicano (also a good place to purchase a range of Mexican handicrafts), located at Calles Madero and Hidalgo.

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Small amounts of vitamin D can be consumed through food, such as fish, cod liver oil, and fortified milk and juice.

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The acid from the lime, lemon or orange juice changes the structure of the proteins in the fish much in the same way that heat does. (If you make it at home, you can observe the flesh turning from translucent to opaque.) Therein lay my answer.

NPR: Cool and Comforting Ceviche

The kitchen serves fried fish dishes and fierce cocktails such as the machacao, made from white rum, lime juice and potent yerba mate tea.

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