In a large saute pan, heat canola oil over medium-high heat. Add onion, peppers, garlic, sweet potato and tomato. Cook for 10-15 minutes, until onions begin to look translucent.
Add rice, lentils, spices, vinegar, stock and water. Bring to boil and reduce to simmer. Cover and cook for 45 minutes.
To serve, toss with kale, black beans and cilantro. Garnish with lime wedges.