First wash the cucumber. Then peel, de-seed, mince it, and set it aside.
In a medium sized mixing bowl, mix together the sour cream, mayo, and lemon juice.
Add in the crushed garlic, garlic powder, dill, salt, and pepper. Stir together.
Finally, add in the cucumber, mixing everything together well.
And that's it! You're ready to serve it with your favorite dish; it can be used as both a sauce and a dip. It pairs deliciously well with grilled fish fillets, fish tacos, salmon patties, gyros, and fresh veggies.
If you're not yet ready to serve the sauce, just cover and chill it in the fridge.