abstract algae background bacteria bacterium bog canal environment environmental fen goo gooey green grunge grungy lake marsh mat nature plant poison poisonous pond scum Slime slimy stagnant swamp texture thick toxic water weed wet beef boil boiled brine color colour cook cooked cooking corned corned-beef cut edible food meals meat pink pot preparation prepare protein salt salty silverside simmer simmering skim slab slow slow-cooking surface tasty tender textures vinegar