Preheat the oven to 350 degrees F. Lightly oil a loaf pan.
Add the cooked brown rice, cooked lentils, tomato sauce, balsamic vinegar, flour, nutritional yeast, raw pecans, and dried cranberries to a large mixing bowl and stir to combine.
In a small mixing bowl, whisk together the ground flax seed with the water. Allow it to sit for 15 minutes, stirring occasionally. This mixture will thicken substantially and will have an egg-like consistency after it sits.
Meanwhile, in a large skillet, add the olive oil and heat to medium-high. Add the chopped onion and celery and saute, stirring occasionally, until onion is translucent and celery has softened, about 8 minutes.
Add the grated carrot, chopped mushrooms, garlic, grated ginger, curry powder, cayenne, and sea salt. Continue cooking, stirring occasionally, about 3 to 5 minutes.
Add the baby spinach and cook, stirring occasionally, until wilted, about 3 to 5 minutes.
Remove the sauteed vegetables from the heat and allow them to cool for 5 minutes.
Pour the flax “egg” mixture into the mixing bowl with the rice/lentil mixture and stir well. Also transfer the sauteed vegetables to the mixing bowl (Note: at this point, all of the ingredients for the “meatloaf” will be in the mixing bowl). Stir everything together until well-combined.
Transfer the “meatloaf” mixture to the prepared loaf pan and pat it down into an even layer. Place on the center rack of the oven and bake for 40 to 50 minutes, or until loaf has firmed up in the center and is golden-brown around the edges. Allow loaf to cool 20 minutes.
While “meatloaf” is cooling, whisk together the ketchup and apricot preserves for the glaze. Turn the loaf out onto a cutting board, then spread the glaze over the top. Cut thick slices and serve.