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Lemon Aioli
Whisk egg yolk, garlic, and lemon juice in a medium bowl. Whisking constantly, drizzle in vegetable oil, then olive oil in a slow, steady stream; whisk until aioli is emulsified.
DO AHEAD- Aioli can be made 1 day ahead. Keep chilled.
Mussels
Heat oil in a large heavy pot over medium-high heat. Add onion, season with salt and pepper, and cook, stirring often, until softened, about 5 minutes. Add garlic and cook, stirring often, until fragrant, about 1 minute. Add tomato paste and cook, stirring, until it begins to darken, about 2 minutes. Add wine and bring to a boil. Reduce heat and simmer until liquid is slightly reduced, about 1 minute.
Add mussels and 1/2 cup water to pot, cover, and reduce heat to medium. Cook, stirring occasionally, until mussels open (discard any that do not open), 10–12 minutes.
Ladle mussels and broth into shallow bowls and top with thyme; serve with bread and lemon aioli.
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