Cook the lentils until just tender. Do not overcook. Drain and set aside, or use canned lentils (drained and rinsed).
Cook the pasta in a separate saucepan until al dente. Drain, reserving some of the pasta water.
Soften okra: Add the marinara sauce and frozen okra to a medium saucepan (use high sides if using an immersion blender to prevent splashing).
Blend okra directly in the pan using an immersion blender, adding water (or the reserved pasta cooking water) as needed until smooth and creamy.
Blend the nondairy cream: Add the water, hemp hearts, miso, lemon juice, and garlic to a jar or tall container. Blend with the same immersion blender until smooth, or use a high-speed blender.
Stir the cream sauce into the tomato-okra sauce and heat gently, or keep it separate and add when serving.
For serving: Serve the cooked pasta topped with the tomato-okra sauce and lentils, then top with the cream sauce. Or combine everything in a saucepan before serving.
Notes
For crispy roasted lentils: Pat the cooked lentils dry, then spread on a baking sheet. Roast at 400°F (200°C) for 20–30 minutes until crispy, tossing halfway through. Use as a crunchy topping before serving.