A thin porridge. (Merriam – Webster)
Something that lacks substance or significance. (Merriam – Webster)
Gruel is a food made by boiling oats with water or milk. (Collins Dictionary)
A cheap simple food made, especially in the past, by boiling oats with water or milk. (Cambridge Dictionary)
Gruel all round as the Victorian workhouse diet makes a comeback.
Gruel with a twist: can food trends get any weirder?
Gruel, the Real Deal.