INGREDIENTS
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1 large egg yolk
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1 garlic clove, finely grated
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1 teaspoon (or more) fresh lemon juice
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1/4 cup vegetable oil
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1/4 cup extra-virgin olive oil
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Kosher salt
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2 tablespoons olive oil
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1 medium yellow onion, chopped
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Kosher salt, freshly ground pepper
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2 garlic cloves, finely chopped
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2 tablespoons tomato paste
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1/2 cup white wine
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4 pounds mussels, debearded, scrubbed
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2 teaspoons fresh thyme leaves
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Sliced country-style bread, toasted (for serving)