Spread garlic paste on roast and salt & pepper to taste. In a cast iron enamel pot, coat the bottom of the pot with olive oil. Heat over med-high, and add the beef. Brown both sides well, then turn fattiest side down. Turn heat to LOW. Add 1 1/2 cups of water. Add 1 onion, minced. Let cook on LOW heat for 1 1/2 - 1 3/4 hrs. Covered. Add potatoes, carrots, and onions. Leave on LOW for another 1 1/2 hours, covered. Remove meat and veggies from the pot. Add gravy master. In a glass, mix flour and water until it has a batter like consistency. Turn pot up to med-high and start whisking, adding the flour/water a little at a time. Serve your roast with veggies and gravy.