Melt butter in a pan. Add sliced chicken and stir until cooked through. Add cherry tomatoes and cooked pasta. Season with salt, pepper and lemon juice.
Melt 1/4 cup butter in a pot. Add 1/2 cup white wine. Bring to a boil. Add 1 kg cleaned mussels. Cook, covered, until mussels have opened, 8 to 10 minutes. Discard any closed mussels.
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