1. Gently melt the butter until warm, not hot.
2. Stir in the juice of one lemon, then add the anchovies, capers, and rosemary.
3. Whisk everything together until smooth and slightly thickened.
4. You’re aiming for a rich sauce with a lemony zing, not greasy.
5. Need more tang? A splash of extra lemon juice will balance it out perfectly.
6. Warm it up just before serving and watch as it transforms your dish into something unforgettable.

This sauce hits all the right notes: creamy, herby, and packed with umami goodness. Whether you’re hosting a backyard BBQ or just sprucing up a simple roast, it’s a guaranteed crowd-pleaser.