Peel the tomatoes. Make two holes in the bottom and with a tooth pick remove the seeds. Wash once and place in lime water for 10 minutes. Next, wash 5-6 times to clean and let drain. Put almonds inside each tomato. Place the tomatoes in a pot in rows and cover with sugar. Let sit for 12 hours. Then add as much water as needed to cover the tomatoes. Pour the tomatoes into a large bowl and boil until the mixture thickens. Add the citric acid and the vanilla.