a structure in the chloroplast of photosynthesizing cells, usu. one of an interconnected stack, having a pigmented membrane that is the site of photosynthesis. [< German Thylakoid (1961) < Greek thÈ³lakoeidá¸s resembling a bag =thylak(os) sack + -oÄidÄs -oid]
Round or rump roast almost two hours to reach medium rare, 3-pound roast six hours on low or longer. In a crock pot. On the stove top in a Dutch oven around two hours. Extra 15 minutes may be extended for medium or 30 minutes for well done. (source: http://www.ehow.com/way_5260879_long-cook-pound-roast.html).
(Cooking times will vary â the following times are determined from a 3.5 pound roast!). 1  For medium-rare meat the roast should take about 50-55 minutes. 2  A medium roast will take approximately 1 hour exactly. 3  A well done roast will take about 1 hour and 10-15 minutes. It should reach 150 degrees F for a medium-rare roast, 160 degrees F for a medium roast, and 175 degrees F for a rare roast. 2  Cooking temperatures vary depending on the weight of your roast.