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With a very sharp knife, cut heart in half. Trim off valves and sinew (reserve for making stock or grinding into burger meat).
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Cut into one-quarter inch slices. Places in a large dish.
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Add marinade. Let sit for at least 30 minutes.
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Using kabob skewers, alternate slices of beef heart, bell pepper, and onion. Brush leftover marinade over entire skewer (share the love with the veggies!).
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Grill over hot charcoals for 3 min. When lightly brown, flip, and grill for another 3 min. Serve.