In a medium saucepan, heat 1 tbsp (15 mL) oil over medium-high heat. Add onion and garlic; sauté until onion is translucent, 3-5 minutes. Add chipotle pepper and sauté 1 minute. Add diced tomatoes, oregano, cilantro, jalapeno, salt and pepper. Bring to a boil. Reduce heat and simmer 10 minutes; remove from heat. Stir in lime juice. Using immersion blender, purée sauce until almost smooth or to desired consistency. Keep sauce warm over low heat until ready to serve.