For the spaghetti in tuna top sauce, cook spaghetti according to package directions. Squeeze the lemon, squeeze the garlic as well.
Heat oil and fry garlic in it until hot. Add tuna and sauté for about 2 minutes. Deglaze with lemon juice and whipping cream.
Strain the spaghetti and mix in. Season the spaghetti in tuna top sauce with salt and chives and serve.