Rinse the red lentils under cold water. In a medium pot, combine the lentils with 2 cups of water. Bring to a boil, then reduce the heat and simmer for 15-20 minutes until lentils are tender. Drain any excess water and set aside.
Heat olive oil in a skillet over medium heat. Add diced yellow onion and sauté until translucent and fragrant, about 5-7 minutes.
In a mixing bowl, combine cooked lentils, sautéed onion, marinara sauce, sriracha, ground cumin, cayenne pepper, green onions, and parsley. Mix well.
Transfer mixture to a food processor or blender. Blend until smooth, adding a splash of water if too thick. Adjust seasoning with sea salt, black pepper, and more sriracha if desired.
Transfer the spread to a serving dish. Garnish with additional green onions and parsley if desired. Serve on bread, as a dip, or in wraps. Enjoy!