In a small pot add the brown rice, water, 1 Tbsp butter and ½ tsp salt. Bring it to a boil on medium heat with the lid on. When the water begins to boil turn the heat down to the lowest setting until it’s just simmering. Place the lid slightly askew and cook for 45 minutes.
While the rice cooks you can prepare the rest of the meal at a leisurely pace. Mix 1 tsp salt, cumin, oregano, cayenne and pepper in a small bowl. Sprinkle half the spice mixture over the fillets, coating on both sides. You will use the other half of the spices later during cooking. Set them aside.
Cut the avocado in half and remove the pit. While still in the peel, slice the avocado lengthwise and then widthwise a few times. Use a spoon to scoop the avocado flesh out into a bowl. Sprinkle with salt to taste and half the juice of a lime and mash with a fork until it's as smooth or chunky as you like. Taste and add more salt and lime juice. This is your very simple guacamole!
In a medium pan on medium heat, melt a Tbsp of butter. Add the onion and poblano strips and cook for 5 to 8 minutes, stirring occasionally, until the onions are translucent and you have a few brown spots on the poblanos. Add the garlic and cook for another 2 minutes. Add salt to taste, about ½ tsp. Remove the vegetables from the heat and spoon them into a bowl.
Clean the pan and put it back on high heat with another tablespoon of butter. When the butter is melted, swirl it around the pan. When the pan is hot, add the cod fillets to the pan and let them cook undisturbed for 2 to 3 minutes. Flip and cook for another 2 minutes. They should be brown and crispy on both sides. Using a spatula, gently break up the fish into flaky pieces. Add the vegetable mixture back into the pan and stir. Sprinkle the rest of the spice blend over the everything in the pan, mix and cook for another 2 minutes until warmed through. Set aside until the rice is finished cooking.
When the rice has been cooking for 45 minutes, turn off the heat and take the lid off the pot. Use a spoon or fork to fluff the rice up a bit and then put the lid back on for 2 minutes to steam a bit.
Add the chopped cilantro or basil and lime juice into the rice and mix. Taste and add more cilantro, lime juice or salt to your taste. Done! Now time to assemble.
If you want to make burritos: Place your tortilla on a clean cutting board. Scoop ¼ or ⅓ of the rice onto the tortilla (depending on how many you are feeding and appetites!). Top with ¼ or ⅓ of the fish and vegetable mixture and finally with a dollop of guacamole. Fold the ends of the burrito in toward the centre and roll it up like a carpet. Slice it in half to serve or keep it whole.
For a bowl: Same instructions as above, but scoop into a bowl instead of a burrito. Top with a little chopped cilantro and a squeeze of lime if you have it.