Grilled Mussels with Caramelized Onion and Garlic Butter
Prep
20 mins
Cook
25 mins
Servings
4
Difficulty
Medium
There's something magical about cooking mussels on the grill, and this recipe has become my go to for impressing guests without breaking a sweat. The caramelized onions and garlic butter create this incredible depth of flavor that makes the sweet, briny mussels absolutely irresistible. What I love most is that it comes together in just 45 minutes total, making it perfect for a weeknight dinner or casual entertaining. Plus, mussels are packed with protein and selenium, which supports your immune system beautifully. The best part? This dish is surprisingly affordable compared to other seafood options, so you can feel fancy without the fancy price tag.
Ella x
Ingredients
- 1 kgfresh mussels(cleaned and debearded)
- 3 mediumyellow onions(thinly sliced)
- 6 tablespoonsunsalted butter
- 5garlic cloves(minced)
- 2 tablespoonsfresh thyme(chopped)
- 237 mldry white wine
- 2shallots(finely diced)
- 1lemon(cut into wedges)
- 1 teaspoonsea salt
- 1 teaspoonblack pepper
- 2 tablespoonsolive oil
- 3 tablespoonsfresh parsley(chopped)
Detail level
Instructions
- 1
Heat 2 tablespoons of olive oil in a large skillet over medium heat. Add the sliced onions and cook for 15-18 minutes, stirring occasionally, until deeply golden and caramelized.
Tip: Low and slow is key—resist the urge to increase heat, as this allows the onions to develop natural sweetness without burning.
- 2
In the final 2 minutes of caramelizing, stir in the minced garlic and fresh thyme, cooking until fragrant.
- 3
Preheat your grill to medium-high heat, about 450°F. Pat the cleaned mussels dry with paper towels.
Tip: Dry mussels will char better on the grill and create a beautiful crust.
- 4
Prepare the garlic butter by combining softened butter, remaining minced garlic, diced shallots, sea salt, and black pepper in a small bowl.
- 5
Oil the grill grates lightly. Place mussels on the grill with the curved side down and cook for 3-4 minutes until the shells open slightly.
Tip: Discard any mussels that don't open after grilling, as they may not be fresh.
- 6
Transfer opened mussels to a serving platter. Spoon a generous portion of caramelized onions onto each mussel.
- 7
Top each mussel with a small dollop of garlic butter and sprinkle with fresh chopped parsley.
Tip: The residual heat will melt the butter perfectly over the hot mussels.
- 8
Deglaze the skillet with white wine by pouring it in and scraping up any flavorful browned bits. Simmer for 1-2 minutes, then drizzle this pan sauce over the mussels.
Tip: This wine reduction adds depth and prevents the dish from being too rich.
- 9
Serve immediately with lemon wedges on the side for brightness and additional acidity.
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