2 Tbsp butter
1/2 cup yellow onion diced
2 Tbsp garlic minced
1 cup white wine
1 cup chicken stock
1 Tbsp lemon juice (~1 large lemon)
1 Tbsp dried parsley
1/8 tsp red pepper flakes
1/4 pound butter (8 tablespoons, one stick)
Heat a medium saucepan over medium heat. Add 2 Tablespoons of butter until melted.
Add the onion and garlic to the butter and cook until just soft but not brown, approximately 3 minutes.
Add the white wine and simmer to burn off some of the alcohol and reduce 2 minutes. Scrape up any bits from the bottom of the pot while simmering.
Add the chicken stock, lemon juice, parsley, and crushed red pepper. Simmer 5 minutes.
Remove the sauce from the heat and whisk in the remaining 8 Tablespoons (1/4 stick) of butter until incorporated.