Seared Sirloin Steak and Shallot Demi-Glace with Caramelized Onion Mashed Potatoes and Green Salad

Wash and dry all produce. Halve, peel, and thinly slice onion. Halve, peel, and thinly slice shallot. Mince a few slices until you have 3 TBSP minced shallot. Dice potatoes into ½-inch pieces. Halve lemon. Place cranberries in a medium bowl with enough hot water to cover by 1 inch.