In a small skillet, saute onion in oil until tender. In a microwave-safe dish, whisk together water and soup mix. Microwave, uncovered, on high for 1-1/2 to 2 minutes, whisking occasionally. Add soup to sauteed onions. Stir in the broccoli, tuna, milk, salt and lemon-pepper; bring to a boil. Reduce heat; simmer for 5 minutes or until broccoli is tender. Stir in rice. Cook and stir 2-3 minutes longer or until heated through. Sprinkle with almonds.