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To make muffins: Sift flour, baking soda and salt together.
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Grate the rind of 5 lemons; set the juice aside.
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Whisk eggs; add sour cream, melted butter, and lemon juice; whisk until smooth.
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Fold in the lemon rind.
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Fold flour mixture and sugar into the egg mixture.
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Blend well.
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To make streusel:.
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Sift sugar and flour together.
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Add softened butter, work into dry ingredients until smooth; set aside.
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To make glaze: Stir sugar and lemon juice together until all the sugar is dissolved.
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Spray muffin tins.
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Fill with lemon muffin batter.
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Top each muffin with streusel.
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Bake at 350 degrees Fahrenheit for 18-20 minutes.
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Poke muffins with a toothpick to make sure they are done.
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Drizzle top with lemon glaze.
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Remove from muffin tin and store in airtight container.
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Note: Batter can be kept in fridge for up to 1 week.