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["Preheat your oven to 350 degrees F .", "Lightly grease a 9"" x 13"" baking pan or two 8"" x 2"" round pans.", "For the lemon streusel: In a medium-sized bowl whisk together the sugar, flour, and salt.", "Gently toss the candied peel or zest until it is well coated.", "If you prefer smaller pieces of peel, you can pulse the mixture 10-12 times with a food processor at this point.", "For a bigger lemon ""bite"" leave as is.", "Work the softened butter into the flour/peel mixture until it resembles granola, some larger chunks, some smaller.", "Sprinkle on the lemon oil and toss again to combine.", "Set mixture aside.", "For the cake: Cream the butter and sugar until light colored and fluffy.", "Add the eggs one at a time and beat after each addition.", "Be sure to scrape down the bowl well each time.", "Beat in the sour cream and vanilla.", "In a separate bowl, whisk together the flour, baking powder, baking soda and salt.", "Add to the batter, mixing until combined.", "Avoid overbeating or the cake will become tough.", "Gently fold in the blueberries and zest until well distributed throughout the batter.", "Pour into the prepared pan(s) and spread evenly.", "Sprinkle with the lemon streusel until the batter is completely covered.", "Bake for 30-35 minutes or until a toothpick inserted into the center of the cake comes out clean.", "Cool on a rack for 15-20 minutes before serving."]
