1) Place the onions, garlic, and peppers in the bowl of a food processor and process for about 1 minute, until smooth with small chunks. It will be a bit slushy, but not mush.
2) In a large saucepan or small stockpot set over high heat, heat the the red palm oil until it is clear and shimmers. Add the pepper mixture and cook, stirring gently, about 8 to 10 minutes, until the liquid is almost gone. It will be very fragrant and a bit mushy. Add the salt and pepper and stir.
4) With tongs, add the collard greens, turning gently to coat them with the oil and pepper mixture. Add the water and stir to incorporate. Add the kale and turn to coat; and add the spinach, turning to coat and and stirring to incorporate. The greens may well exceed the height of the pan, but do not fear-- they will collapse as they cook by about 75 percent. Cover the pot, reduce to a simmer, and cook for 45 minutes to 1 hour, stirring occasionally, or until the collard greens are completely soft ( hey are the least tender green in this bunch) and the collards have turned a green khaki color.