Tomato Avocado Burgers

Ingredients
Serves 4

4 large tomatoes
1 lb / 453 gr grass fed organic ground beef
¼ teaspoon ground black pepper
½ + ¼ teaspoons fine grain sea salt
1 teaspoon chili powder
1 ripe avocado, divided
2 tablespoons Greek yogurt
1 tablespoon mayo
2 teaspoons fresh lime juice
¼ teaspoon ground cumin

handful alfalfa sprouts

Directions

Cut the tomatoes in half horizontally. With the handle-end of a spoon or a fork, scoop out the seeds and seeds membrane. Set aside.
Place half of the avocado in a bowl and mash with a fork until almost smooth. Add yogurt, mayo, lime juice and cumin and stir to combine. Dice remaining half of the avocado and add it alongside ¼ teaspoon salt. Stir gently to combine. Set aside.
In a bowl season ground beef with ½ teaspoon of salt, black pepper and chili powder and mix well.
Divide into equal 4 portions and gently shape each portion into ½-inch thick patty.
Preheat grill (or grill pan) to medium-high heat. Grill patties 3 minutes on each side or until desired degree of doneness.
In the meantime, lightly grease with olive oil a medium non-stick pan/skillet and heat over medium-high heat. Cook halved tomatoes face down for 2 to 3 minutes, until they begin to brown.
Flip and cook for 20 seconds on the other side so that they get a bit of color.
To assemble burgers, place a large pinch of sprouts on the bottom part of each tomato, top with a beef patty, about 2 tablespoons of avocado sauce and finish with the other half of each tomato.

Source: http://www.theironyou.com/2013/08/tomato-avocado-burgers-low-carb-and.html#more