Salmon, cucumber, and mint sandwiches

6 oz , drained, large pieces of skin and bone removed canned salmon

1 item(s) , cut into small dice persian (mini) cucumber

1/4 cup(s), chopped , chopped uncooked red onion(s)

8 large , pitted Kalamata, chopped olive(s)

3 Tbsp plain fat free greek yogurt

2 Tbsp , chopped fresh mint leaves

1 tsp , grated zest from 1/2 lime raw lime peel

1 Tbsp , from 1/2 lime fresh lime juice

1/4 tsp , or to taste table salt

1/4 tsp , or to taste sriracha chili sauce

8 oz , baguette, split and bready center removed whole wheat french bread

4 leaf/leaves, large , red leaf variety lettuce

8 slice(s) , thick fresh tomato(es)