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Place steaks in large re-sealable plastic bag. Set aside.
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In a bowl, whisk together BBQ sauce (either full amount or reserve 30 mL or 2 tbsp. to drizzle over fajitas), lime juice, honey and half the oil. Pour half the marinade into bag containing the meat.
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Refrigerate remaining marinade. Remove as much excess air as possible from bag and seal closed. Refrigerate at least 1 hour or, for maximum flavour, overnight, turning the bag occasionally.
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Remove steaks from bag (discarding marinade in bag) and place on grill preheated to medium-high. Grill, brushing steaks with refrigerated marinade, 3 or 4 minutes per side or until desired doneness. Remove steaks from grill and rest 5 to 10 minutes.
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Meanwhile, toss peppers and onion in remaining oil. Grill 8 to 10 minutes, turning occasionally, until tender and lightly charred. Remove from grill. Slice peppers and steaks into strips.
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Fill tortillas with steak, peppers, and onion; top with guacamole. Drizzle with reserved BBQ sauce, if using. Fold over tortillas to serve. Serve alongside a green salad with herb dressing.
Chef’s secret: For slightly less spicy fajitas, replace the jalapeño peppers with green and red sweet peppers.