Season the steak tips with salt and pepper, or a steak seasoning rub of your choice. Let the steak marinate for at least an hour. Divide the meat between four metal skewers.
Heat the broiler for 10 minutes. While the broiler is warming, make the gastrique.
In a small food processor, puree the avocado, vinegar, olive oil, salt and chipotle chile until it is smooth. Stop and scrape down the bowl if needed. Place the gastrique into a small serving dish.
Broil the steak for 3-5 minutes per side, depending on how done you like your steak. Serve the skewers with the avocado gastrique dipping sauce.
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