Just because you are in lockdown, don't think that you have to eliminate fish from your diet. Buy a selection of the freshest fish you can lay your hands on - be adventurous and try options you are less familiar with. Plan to cook some that night and freeze the rest as soon as possible. This way you can enjoy it throughout the week or two weeks inbetween your grocery runs. Fish soup is a wonderful springtime dish; light and easy to digest, bursting with flavor but still filling enough for a satisfying dinner.