Prepare the shrimp

• Parboil the shrimp briefly, then drain and let cool.
• Alternatively, leave the shrimp raw to cure fully in the lime juice.

Chop the vegetables

• Finely dice the red onion, serrano pepper, roma tomato and cucumber.
• Slice the white part of the green onions and chop the cilantro.

Cure the shrimp in lime

• Squeeze the limes over the shrimp and toss to coat.
• Let the shrimp cure in the lime juice until opaque and firm.

Combine and season

• Add the onion, cilantro, green onion, serrano, tomato and cucumber to the shrimp.
• Season with salt and hot sauce to taste and mix well.

Chill and serve

• Chill the ceviche before serving with tostadas or chips.