Butter tarts

Butter tart is a humble food that achieved iconic status in early 20th-century Canada. The filling is traditionally made with a combination of walnuts, eggs, brown sugar, butter, and white vinegar, and it's then placed into small, flaky, deep or shallow tart shells before baking. Early versions of the recipe, dating back to 1915, suggest that currants and raisins should also be included in the mixture. There are lots of theories about the origin of the tart – some say that it is related to pecan pie, which was brought to the country by American slaves, some say it evolved from Quebec's sugar pie, while others say it's linked to Border Tarts from southern Scotland. Regardless of their origin, butter tarts are nowadays especially popular in the provinces of Ontario and Nova Scotia. The color of baked tarts depends on the darkness of the brown sugar used, and the filling on the interior can be either solid or runny (for a runny tart, the cooking time is shortened).