In a medium skillet, heat the butter and olive oil over medium heat until the butter melts and starts to bubble.
Add the minced garlic and sauté for 1–2 minutes until fragrant but not browned.
Pour in the white grape juice or chicken broth. Stir and simmer for 2–3 minutes.
Stir in the lemon juice, capers, and lemon zest. Season with salt and black pepper to taste. Cook for another 1–2 minutes.
Remove from heat and stir in the chopped parsley if desired.
Drizzle the sauce over your favorite fish, chicken, pasta, or veggies while still warm.