Seared Tuna On A Bed Of Leaf Lettuce

• 7 scallions thinly (sliced white)
• 1 head green leaf lettuce
• 1 tuna (cut into)
• 1 head leaf lettuce (red)
• 1 pineapple cored (peeled)
• 1/2 lemon juice
• 240 ml orange juice preferably squeezed (fresh)
• 240 ml vinaigrette dressing for the salsa
• 110 gr fillets
• 30 ml virgin olive oil