Mushroom Picadillo Tostadas/ Picadillo Vegano/ Tostadas

Name: Mushroom Picadillo Tostadas/ Picadillo Vegano/ Tostadas
Cuisine: Latin American, Mediterranean, Spanish, European, American, Mexican
Ingredients: 1 ripe Roma tomato; 1 tablespoon olive oil; 16 Oz Sliced baby bella mushrooms; 1/4 cup chopped onions; 1 garlic clove, minced; 1 russet potato, peel and dice about 1/4" size; 1/2 teaspoon cumin; salt and pepper to taste; refried black beans; Shredded lettuce; chopped tomatoes; cheese