I normally go completely overboard with garlic/onions/lemon juice/tomato and the likes...
but I went the easy route last saturday.

ingredients:

• Your default coop/ica kit of taco mix (sorry southern americans who read this chat later :p)
• half a lemon
• 3-5 cloves of garlic
• vegetable oil (or light olive oil, extra verge becomes tangy when cooked and should only be used for salads imho)
• a few sliced tomatoes or half a can of "Mutti pulpa" (or just 5 sek ICA stuff honestly)
• Vegofärs (the peas stuff is the best)
• Paprica powder, little bit of cayenne if you have it, pinch of Cumin, some parsly and other herbs to taste, salt and black pepper.
• a plant of cilantro/coriander

Prep:

• fry chopped or mashed garlic in 2 or 3 tablespoons of oil (it needs to swim, but just) with a pinch of salt (just to draw the flavour out of the garlic) till the garlic starts to turn yellowish
• Fry the meat/vegofärs at its perscribed time
• Add the tomato juices and have them bake along for 20-30 seconds. they'll caramelize internally slightly evening the taste out
• Add the tex mix with its perscribed bit of water. add a little bit extra water if you have vegofärs as it can be a bit dry
• add the rest of the herbs and spices, not the coriander though
• Add the tomato paste and squeeze half a lemon in

serve, top of with coriander first (if you like that taste) and then proceed to toppings below.

toppings:

• whatever you can get your hands on honestly. If you get eggplant then make sure to slice it up, salt it extensively and have it sweat out its bitter taste in a 200 deg oven for 10 minutes (rinse the salt & sadness off and then pad dry afterward to get perfect umami taste).
• Cheddar cheese, lots of it. the stinkier the better
• Some creme freche or grädfill

There is actually a really good episode online somewhere if you want to go the actual Mexican clean way... or rather there are 2 really awesome recipes that describe the mexican/cuban kitchen really well when it comes to making things good with tomato and chorizo spiced meats:

• https://www.youtube.com/watch?v=mzF2yJRCfss (Cuban Frita burger by George Motz, gets you right into the tomato, garlic traditions and chorizo traditions)
• https://www.youtube.com/watch?v=E0G5Y2SOW0c (Quesadillas by Babbish)

forgot the onion. 1 or 2 red onions go in halfway through the meat baking process.