References to the use of Ulva lactuca as various food, namely soups and salads before 1997. Also referred to as sea lettuce*. In the book:
•Chapman, V.J. and Chapman, D.J. Seaweeds and Their Uses. London: Chapman and Hall, 1980, p. 66
•Madlener. J.C. The Seavegetables book. New york: Clarkson N. Potter, Inc 1977, p. 150-151
* https://www.algaebase.org/search/species/detail/?species_id=39