1.Spread The Olive Oil On The Inside Of A Slow Cooker. Place The Venison Roast Inside, And Cover With Apple, Onions, And Garlic. Turn To Low, And Cook Until The Roast Is Tender, About 6 To 8 Hours. 2.When The Roast Has Cooked, Remove It From The Slow Cooker, And Place Onto A Serving Platter. Discard The Apple. Stir The Water And Bouillon Into The Slow Cooker Until The Bouillon Has Dissolved. Serve This As A Sauce With The Roast.