Ceviche Rapido de Susanne

Like a fancy tuna salad salsa...on tostadas...

1 medium avocado
2 limes, juiced
1 medium cucumber, chopped
4 medium roma tomatoes, chopped
1 jalapeno, minced
2 cans of tuna in water, drained
1/2 small onion, minced
1/2 C chopped cilantro
salt and pepper
olive oil enough to moisten

Combine all in a bowl and serve on a tostada.