Roast Beast

So we had a family christmas thing this past weekend. We decided that we wanted to all get together for the holidays but actually trying to do that on Christmas is nearly impossible... especially for us. We decided that we would potluck the event and my sister assigned different parts of the meal so that we wouldn't end up with only dessert. I got to do the "Main Dish" which makes sense since I was hosting and I have an oven and everyone else had a one-and-a-half-hour commute to get here. I decided to make a beautiful roast beef in the oven with my new roasting pan. I've only ever made roast beef in the slow-cooker. Our beef supplier gave us a large enough roast to feed everyone and that would be perfect for slicing. Yum. It looked amazing. So on saturday I took out my "How To Cook Everything" cookbook (a pretty good cookbook but it has no pictures) and my "Betty Crocker Cookbook" (a standard for me) to figure out how to cook a roast. Now neither book had the cut I had (Inside Round) but other then Tenderloin they were all pretty much the same. Cook at 325 for 20-22 minutes per pound. Now my roast was 1.598kg, so more kitchen math and I decided 1.5 hours would be lots to cook this thing. I preheated the oven at 3:30pm. (Dinner at 5:30). At 4:30 I realized I had forgot to put the roast in. (Dinner at 6:00). We ate all the yummy appetizers brought by my family and we were stuffed. At six we took out the roast and Jeff cut into it. Not even close to being cooked. We turned up the oven to 400 and took a food break for the boys to open some gifts and visit. (Dinner at 7:00). Well, the roast did taste delicious. And there were some potatoes and gravy to eat with it, so it wasn't too weird. In conclusion, I don't know where I went wrong, but it all started with forgetting to put the darn thing in the oven.