Preheat oven to 350°F (180°C). Finely grind the flax. Add hot water and mix, then let rest to thicken. Whisk together remaining dry ingredients. Cut in the margarine to form a corase meal. Combine soy milk and vanilla, and slowly add to dough while mixing to form a thick batter. Add the flax mixture and mix well. Bake 25min or until golden. Cool in pan 15min. Release all around the edges with a knife and flip over to remove from pan. Cut in half and spread jam. Serve with whipped cream.