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1
Add wood chips to grill according to manufacturer's directions.
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2
Cut onions in quarters; place in a small bowl. Add garlic and 1-1/2 teaspoons barbecue seasoning; toss to coat. Arrange on grilling grid; place on greased grill rack. Grill, covered, over medium heat 10-15 minutes or until tender, turning occasionally.
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3
Meanwhile, cut tomatillos, tomatoes and jalapenos in half; place in a large bowl. Add remaining barbecue seasoning; toss to coat. Grill in batches, covered, over medium heat 4-6 minutes or until tender, turning occasionally.
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4
When cool enough to handle, chop vegetables. Transfer to a Dutch oven; stir in vinegar, brown sugar, salt and pepper. Bring to a boil. Reduce heat; simmer, uncovered, 15-20 minutes or until slightly thickened. Immediately stir in cilantro.
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5
Carefully ladle hot mixture into four hot 1-pint jars, leaving 1/2-in. headspace. Remove air bubbles and adjust headspace, if necessary, by adding hot mixture. Wipe rims. Center lids on jars; screw on bands until fingertip tight.
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6
Place jars into canner with simmering water, ensuring that they are completely covered with water. Bring to a boil; process for 15 minutes. Remove jars and cool.
