use any lamb leg steak (also called a sirloin chop) measuring 3 ounces of meat per person as one serving
Tenderizing lean meat – a tip from https://www.tastingtable.com/cook/national/baking-soda-meat-tenderizer-cooks-illustrated

• Dissolve baking soda in water (for every 12 ounces of meat, use 1 teaspoon of baking soda and ½ cup of water).
• Soak the meat in the solution for at least 15 minutes.
• Remove and rinse.

American Lamb Board temperature cooking chart: http://www.americanlamb.com/lamb-cooking-temperature-chart/