1. Drain the tomatoes and put in a medium bowl.
2. Heat the olive oil in a small saucepan on medium heat. Add the jalapeño, season with a pinch of salt, and sauté for 1 to 2 minutes, allowing the pepper to soften and mellow a bit.
3. Add the cinnamon, cook for 30 seconds, and remove from heat.
4. Add the jalapeño and cinnamon mixture to the tomatoes, then add the sugar. Stir to combine, and add more salt and pepper to taste.