Finely grate and drain an English seedless cucumber. Measure out 1/2 cup of the grated cucumber for the sauce. Use any remaining cucumber for another recipe.
Put the sour cream, mayonnaise, finely grated drained cucumber, freshly squeezed lemon juice, fresh minced dill, kosher salt, garlic powder, and coarse ground black pepper in a bowl.
Stir until combined, then cover and chill in the fridge to let the flavors combine.
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Notes
Store in an airtight container in the fridge for 3-4 days.